diff --git a/arch/x86_64/gdt.c b/arch/x86_64/gdt.c
index bd0c333..cc24f64 100644
--- a/arch/x86_64/gdt.c
+++ b/arch/x86_64/gdt.c
@@ -1,6 +1,6 @@
 #include <zinnia/percpu.h>
 #include <stddef.h>
-#include <string.h>
+#include <zinnia/string.h>
 #include <x86_64/asm.h>
 #include <x86_64/defs.h>
 #include <x86_64/gdt.h>
diff --git a/arch/x86_64/include/bits/types.h b/arch/x86_64/include/bits/types.h
index 08807f1..c8dca4f 100644
--- a/arch/x86_64/include/bits/types.h
+++ b/arch/x86_64/include/bits/types.h
@@ -3,4 +3,3 @@
 #include <stdint.h>
 
 typedef uint64_t phys_t;
-typedef uint64_t virt_t;
diff --git a/boot/cmdline.c b/boot/cmdline.c
index dac4b43..34371fb 100644
--- a/boot/cmdline.c
+++ b/boot/cmdline.c
@@ -1,8 +1,8 @@
 #include <zinnia/cmdline.h>
 #include <zinnia/init.h>
 #include <stddef.h>
-#include <stdlib.h>
-#include <string.h>
+#include <zinnia/stdlib.h>
+#include <zinnia/string.h>
 
 // Defined in linker script.
 extern const struct cmdline_option* __ld_cmdline_start[];
diff --git a/boot/limine/entry.c b/boot/limine/entry.c
index 31e0e7a..2928462 100644
--- a/boot/limine/entry.c
+++ b/boot/limine/entry.c
@@ -3,7 +3,7 @@
 #include <zinnia/init.h>
 #include <zinnia/print.h>
 #include <zinnia/utils.h>
-#include <string.h>
+#include <zinnia/string.h>
 #include "limine.h"
 
 [[__initdata_sorted("limine.0")]]
diff --git a/core/console.c b/core/console.c
index fc0d4d9..be4e6b5 100644
--- a/core/console.c
+++ b/core/console.c
@@ -1,7 +1,7 @@
 #include <zinnia/cmdline.h>
 #include <zinnia/console.h>
 #include <zinnia/print.h>
-#include <string.h>
+#include <zinnia/string.h>
 
 extern struct console* const __ld_console_start[];
 extern struct console* const __ld_console_end[];
diff --git a/core/elf.c b/core/elf.c
index 997a417..edd03b3 100644
--- a/core/elf.c
+++ b/core/elf.c
@@ -11,7 +11,7 @@
 #include <zinnia/vma.h>
 #include <zinnia/vmo.h>
 #include <bits/elf.h>
-#include <string.h>
+#include <zinnia/string.h>
 
 struct exec_info {
     struct vma* space;
diff --git a/core/lib/stdlib.c b/core/lib/stdlib.c
index 611991c..17ec99d 100644
--- a/core/lib/stdlib.c
+++ b/core/lib/stdlib.c
@@ -1,6 +1,6 @@
 #include <stdint.h>
-#include <stdlib.h>
-#include <string.h>
+#include <zinnia/stdlib.h>
+#include <zinnia/string.h>
 
 static void reverse(char* s) {
     int i, j;
diff --git a/core/lib/string.c b/core/lib/string.c
index b38095a..e07ed06 100644
--- a/core/lib/string.c
+++ b/core/lib/string.c
@@ -2,7 +2,7 @@
 #include <zinnia/utils.h>
 #include <stddef.h>
 #include <stdint.h>
-#include <string.h>
+#include <zinnia/string.h>
 
 [[__hot]]
 size_t strlen(const char* str) {
diff --git a/core/mem/init.c b/core/mem/init.c
index d808c65..7ba512f 100644
--- a/core/mem/init.c
+++ b/core/mem/init.c
@@ -5,7 +5,7 @@
 #include <zinnia/print.h>
 #include <zinnia/utils.h>
 #include <zinnia/vma.h>
-#include <string.h>
+#include <zinnia/string.h>
 
 extern uint8_t __ld_text_start[];
 extern uint8_t __ld_text_end[];
diff --git a/core/mem/pmap.c b/core/mem/pmap.c
index 7187c52..ae4d88c 100644
--- a/core/mem/pmap.c
+++ b/core/mem/pmap.c
@@ -4,7 +4,7 @@
 #include <zinnia/spin.h>
 #include <zinnia/vma.h>
 #include <config.h>
-#include <string.h>
+#include <zinnia/string.h>
 
 // TODO: For now, we assume that we can do generic PTE lookups on every arch that has a MMU.
 static_assert(CONFIG_HAVE_MMU_GENERIC);
diff --git a/core/mem/pmm.c b/core/mem/pmm.c
index 9619e80..3ba9c7f 100644
--- a/core/mem/pmm.c
+++ b/core/mem/pmm.c
@@ -5,7 +5,7 @@
 #include <zinnia/spin.h>
 #include <zinnia/virt.h>
 #include <stdint.h>
-#include <string.h>
+#include <zinnia/string.h>
 
 uintptr_t mem_hhdm_base = 0;
 
diff --git a/core/mem/slab.c b/core/mem/slab.c
index 9f3d7fc..7dd4927 100644
--- a/core/mem/slab.c
+++ b/core/mem/slab.c
@@ -2,7 +2,7 @@
 #include <zinnia/compiler.h>
 #include <zinnia/errno.h>
 #include <zinnia/spin.h>
-#include <string.h>
+#include <zinnia/string.h>
 
 typedef struct {
     size_t num_pages; // Amount of pages connected to this slab.
diff --git a/core/mem/vmo.c b/core/mem/vmo.c
index eab22fc..88db73a 100644
--- a/core/mem/vmo.c
+++ b/core/mem/vmo.c
@@ -3,7 +3,7 @@
 #include <zinnia/list.h>
 #include <zinnia/utils.h>
 #include <zinnia/vmo.h>
-#include <string.h>
+#include <zinnia/string.h>
 
 errno_t vmo_read(struct vmo* obj, uintptr_t offset, void* buf, size_t len, size_t* actual_read) {
     const size_t page_size = arch_mem_page_size();
diff --git a/core/print.c b/core/print.c
index 331ac7f..918b13e 100644
--- a/core/print.c
+++ b/core/print.c
@@ -5,8 +5,8 @@
 #include <stdarg.h>
 #include <stddef.h>
 #include <stdint.h>
-#include <stdlib.h>
-#include <string.h>
+#include <zinnia/stdlib.h>
+#include <zinnia/string.h>
 
 typedef void (*log_fn_t)(void* ctx, const char* buf, size_t len);
 
diff --git a/core/sched/sched_dumb.c b/core/sched/sched_dumb.c
index e37b835..012f5b9 100644
--- a/core/sched/sched_dumb.c
+++ b/core/sched/sched_dumb.c
@@ -13,7 +13,7 @@
 #include <zinnia/vma.h>
 #include <arch/sched.h>
 #include <stdint.h>
-#include <string.h>
+#include <zinnia/string.h>
 
 static void idle_func(uintptr_t) {
     while (1) {
diff --git a/include/stdarg.h b/include/stdarg.h
deleted file mode 100644
index af6bebe..0000000
--- a/include/stdarg.h
+++ /dev/null
@@ -1,7 +0,0 @@
-#pragma once
-
-typedef __builtin_va_list va_list;
-#define va_start(v, l) __builtin_va_start(v, l)
-#define va_end(v)      __builtin_va_end(v)
-#define va_arg(v, T)   __builtin_va_arg(v, T)
-#define va_copy(d, s)  __builtin_va_copy(d, s)
diff --git a/include/stddef.h b/include/stddef.h
deleted file mode 100644
index 803d089..0000000
--- a/include/stddef.h
+++ /dev/null
@@ -1,7 +0,0 @@
-#pragma once
-
-typedef unsigned long size_t;
-typedef signed long ssize_t;
-
-#define offsetof(type, member) __builtin_offsetof(type, member)
-#define unreachable()          __builtin_unreachable()
diff --git a/include/stdint.h b/include/stdint.h
deleted file mode 100644
index ad5745c..0000000
--- a/include/stdint.h
+++ /dev/null
@@ -1,26 +0,0 @@
-#pragma once
-
-typedef __INT8_TYPE__ int8_t;
-typedef __UINT8_TYPE__ uint8_t;
-#define INT8_MAX  __INT8_MAX__
-#define UINT8_MAX __UINT8_MAX__
-
-typedef __INT16_TYPE__ int16_t;
-typedef __UINT16_TYPE__ uint16_t;
-#define INT16_MAX  __INT16_MAX__
-#define UINT16_MAX __UINT16_MAX__
-
-typedef __INT32_TYPE__ int32_t;
-typedef __UINT32_TYPE__ uint32_t;
-#define INT32_MAX  __INT32_MAX__
-#define UINT32_MAX __UINT32_MAX__
-
-typedef __INT64_TYPE__ int64_t;
-typedef __UINT64_TYPE__ uint64_t;
-#define INT64_MAX  __INT64_MAX__
-#define UINT64_MAX __UINT64_MAX__
-
-typedef __INTPTR_TYPE__ intptr_t;
-typedef __UINTPTR_TYPE__ uintptr_t;
-#define INTPTR_MAX  __INTPTR_MAX__
-#define UINTPTR_MAX __UINTPTR_MAX__
diff --git a/include/uapi/types.h b/include/uapi/types.h
index 24495b2..60b5440 100644
--- a/include/uapi/types.h
+++ b/include/uapi/types.h
@@ -4,6 +4,7 @@
 
 #include <stdint.h>
 
+typedef intptr_t __ssize_t;
 typedef int64_t __off_t;
 typedef __off_t __off64_t;
 typedef uintptr_t __blksize_t;
diff --git a/include/zinnia/hashmap.h b/include/zinnia/hashmap.h
index 66bf342..b8b94f9 100644
--- a/include/zinnia/hashmap.h
+++ b/include/zinnia/hashmap.h
@@ -4,7 +4,7 @@
 #include <zinnia/errno.h>
 #include <stddef.h>
 #include <stdint.h>
-#include <string.h>
+#include <zinnia/string.h>
 
 #define hashmap(K, V) \
     struct { \
diff --git a/include/stdlib.h b/include/zinnia/stdlib.h
similarity index 100%
rename from include/stdlib.h
rename to include/zinnia/stdlib.h
diff --git a/include/string.h b/include/zinnia/string.h
similarity index 100%
rename from include/string.h
rename to include/zinnia/string.h
diff --git a/include/zinnia/types.h b/include/zinnia/types.h
index 4716ef1..ea97d7d 100644
--- a/include/zinnia/types.h
+++ b/include/zinnia/types.h
@@ -5,8 +5,8 @@
 #include <uapi/types.h>
 
 ASSERT_TYPE(phys_t);
-ASSERT_TYPE(virt_t);
 
+typedef __ssize_t ssize_t;
 typedef __off_t off_t;
 typedef __off64_t off64_t;
 typedef __blksize_t blksize_t;
diff --git a/include/zinnia/vec.h b/include/zinnia/vec.h
index d2207e1..8f36630 100644
--- a/include/zinnia/vec.h
+++ b/include/zinnia/vec.h
@@ -3,7 +3,7 @@
 #include <zinnia/alloc.h>
 #include <zinnia/errno.h>
 #include <stddef.h> // IWYU pragma: keep
-#include <string.h> // IWYU pragma: keep
+#include <zinnia/string.h> // IWYU pragma: keep
 
 #define vec(T) \
     struct { \
diff --git a/include/zinnia/virt.h b/include/zinnia/virt.h
index 5690cb1..31f520d 100644
--- a/include/zinnia/virt.h
+++ b/include/zinnia/virt.h
@@ -30,9 +30,9 @@ uintptr_t vm_page_addr(struct page* page);
 
 // Allocator for virtual memory.
 struct vm_alloc {
-    virt_t start_page;
-    virt_t end_page;
-    virt_t next_fit;
+    uintptr_t start_page;
+    uintptr_t end_page;
+    uintptr_t next_fit;
     hashmap(int, void);
 };
 
diff --git a/meson.build b/meson.build
index 9b12c51..0442e38 100644
--- a/meson.build
+++ b/meson.build
@@ -39,7 +39,6 @@ add_project_arguments(
     '-ffunction-sections',
     '-fdata-sections',
     '-ffreestanding',
-    '-nostdinc', # We provide our own headers.
     '-fno-stack-protector',
     language: 'c',
 )
diff --git a/syscalls/uname.c b/syscalls/uname.c
index 28bcaba..d8964e0 100644
--- a/syscalls/uname.c
+++ b/syscalls/uname.c
@@ -2,7 +2,7 @@
 #include <zinnia/syscall.h>
 #include <zinnia/usercopy.h>
 #include <config.h>
-#include <string.h>
+#include <zinnia/string.h>
 #include <uapi/utsname.h>
 
 static struct spinlock uname_lock = {};