diff --git a/src/arch/x86_64/arch_ctl.c b/src/arch/x86_64/arch_ctl.c
index e04370ca..34c52b22 100644
--- a/src/arch/x86_64/arch_ctl.c
+++ b/src/arch/x86_64/arch_ctl.c
@@ -3,7 +3,7 @@
 #include <errno.h>
 
 #define ARCH_CTL_GSBASE 0
-
+#define ARCH_CTL_FSBASE 1
 
 syscallret syscall_arch_ctl(int func, void* arg){
 	
@@ -16,6 +16,9 @@ syscallret syscall_arch_ctl(int func, void* arg){
 		case ARCH_CTL_GSBASE:
 			wrmsr(MSR_KERNELGSBASE, (uint64_t)arg);
 			break;
+		case ARCH_CTL_FSBASE:
+			wrmsr(MSR_FSBASE, (uint64_t)arg);
+			break;
 		default:
 			retv.errno = EINVAL;