Index: uspace/lib/c/include/malloc.h
===================================================================
--- uspace/lib/c/include/malloc.h	(revision 7e752b2a0d66c871748e5fa9e8bbe3a27c70a202)
+++ uspace/lib/c/include/malloc.h	(revision 273b958872eafb2faf26c7da2b6179f641f689c2)
@@ -41,7 +41,10 @@
 extern uintptr_t get_max_heap_addr(void);
 
-extern void *malloc(const size_t size);
-extern void *calloc(const size_t nmemb, const size_t size);
-extern void *memalign(const size_t align, const size_t size);
+extern void *malloc(const size_t size)
+    __attribute__((malloc));
+extern void *calloc(const size_t nmemb, const size_t size)
+    __attribute__((malloc));
+extern void *memalign(const size_t align, const size_t size)
+    __attribute__((malloc));
 extern void *realloc(const void *addr, const size_t size);
 extern void free(const void *addr);