diff --git a/newlib/libc/stdlib/aligned_alloc.c b/newlib/libc/stdlib/aligned_alloc.c
index feb22c24b..06b3883cf 100644
--- a/newlib/libc/stdlib/aligned_alloc.c
+++ b/newlib/libc/stdlib/aligned_alloc.c
@@ -28,6 +28,7 @@
 
 #include <reent.h>
 #include <stdlib.h>
+#include <malloc.h>
 
 void *
 aligned_alloc (size_t align, size_t size)