diff --git a/3rdparty/astc/astc_codec_internals.h b/3rdparty/astc/astc_codec_internals.h
index a87cc63..13356ae 100644
--- a/3rdparty/astc/astc_codec_internals.h
+++ b/3rdparty/astc/astc_codec_internals.h
@@ -19,6 +19,7 @@
 
 #include <stdint.h>
 #include <stdlib.h>
+#include <math.h>
 #include "mathlib.h"
 
 #ifndef MIN