diff --git a/src/gallium/auxiliary/util/u_bitcast.h b/src/gallium/auxiliary/util/u_bitcast.h
index b1f99383738..e8fb0fe3288 100644
--- a/src/gallium/auxiliary/util/u_bitcast.h
+++ b/src/gallium/auxiliary/util/u_bitcast.h
@@ -30,6 +30,8 @@
 
 #include <string.h>
 
+#include "c99_compat.h"
+
 #ifdef __cplusplus
 extern "C" {
 #endif