diff --git a/src/util/u_string.h b/src/util/u_string.h
index 48f1125ccf1..5a2a3e9817f 100644
--- a/src/util/u_string.h
+++ b/src/util/u_string.h
@@ -38,6 +38,7 @@
 #if !defined(XF86_LIBC_H)
 #include <stdio.h>
 #endif
+#include <stdlib.h>
 #include <stddef.h>
 #include <stdarg.h>