diff --git a/src/gallium/auxiliary/util/u_math.h b/src/gallium/auxiliary/util/u_math.h
index 3d27a59e8c0..58070a9dafa 100644
--- a/src/gallium/auxiliary/util/u_math.h
+++ b/src/gallium/auxiliary/util/u_math.h
@@ -42,6 +42,7 @@
 #include "pipe/p_compiler.h"
 
 #include "c99_math.h"
+#include <assert.h>
 #include <float.h>
 #include <stdarg.h>