diff --git a/src/include/stdlib.h b/src/include/stdlib.h
index 2fc6805c73..35e8b3229a 100644
--- a/src/include/stdlib.h
+++ b/src/include/stdlib.h
@@ -9,6 +9,7 @@
 #define __ALIGN_MASK(x,mask)    (((x)+(mask))&~(mask))
 #define ALIGN_UP(x,a)           ALIGN((x),(a))
 #define ALIGN_DOWN(x,a)         ((x) & ~((typeof(x))(a)-1UL))
+#define IS_ALIGNED(x,a)         (((x) & ((typeof(x))(a)-1UL)) == 0)
 
 #define MIN(a,b) ((a) < (b) ? (a) : (b))
 #define MAX(a,b) ((a) > (b) ? (a) : (b))