diff --git a/transcoder/basisu.h b/transcoder/basisu.h
index d4e339e9..b05927e0 100644
--- a/transcoder/basisu.h
+++ b/transcoder/basisu.h
@@ -37,6 +37,7 @@
 #include <stdint.h>
 
 #include <algorithm>
+#include <cmath>
 #include <limits>
 #include <functional>
 #include <iterator>