diff --git a/src/gallium/auxiliary/util/u_math.h b/src/gallium/auxiliary/util/u_math.h
index bc3948875a9..702d4e9d403 100644
--- a/src/gallium/auxiliary/util/u_math.h
+++ b/src/gallium/auxiliary/util/u_math.h
@@ -48,6 +48,7 @@ extern "C" {
 
 
 #include <math.h>
+#include <float.h>
 #include <stdarg.h>
 
 #ifdef PIPE_OS_UNIX
@@ -133,6 +134,9 @@ roundf(float x)
    return x >= 0.0f ? floorf(x + 0.5f) : ceilf(x - 0.5f);
 }
 
+#define INFINITY (DBL_MAX + DBL_MAX)
+#define NAN (INFINITY - INFINITY)
+
 #endif /* _MSC_VER */