diff --git a/examples/alffplay.cpp b/examples/alffplay.cpp
index 7f83f61d..6f6773a4 100644
--- a/examples/alffplay.cpp
+++ b/examples/alffplay.cpp
@@ -18,6 +18,7 @@
 #include <mutex>
 #include <deque>
 #include <array>
+#include <cmath>
 
 extern "C" {
 #include "libavcodec/avcodec.h"