diff --git a/kernel-src/include/util.h b/kernel-src/include/util.h
index 8acc3223..287bfea0 100644
--- a/kernel-src/include/util.h
+++ b/kernel-src/include/util.h
@@ -4,4 +4,8 @@
 #define ROUND_DOWN(v, n) ((v) - ((v) % (n)))
 #define ROUND_UP(v, n) ROUND_DOWN((v) + (n) - 1, n)
 
+static inline long abs(long x) {
+	return x < 0 ? -x : x;
+}
+
 #endif