diff --git a/leakmalloc.h b/leakmalloc.h
index 5a0248b..8134c0b 100644
--- a/leakmalloc.h
+++ b/leakmalloc.h
@@ -18,6 +18,8 @@
 #define _LEAKMALLOC_H
 
 #include <sys/types.h>
+#include <stdlib.h>
+#include <string.h>
 
 char *leak_strdup(const char *s);
 void *leak_malloc(size_t len);