diff --git a/examples/ggwave-gui/common.cpp b/examples/ggwave-gui/common.cpp
index 7a051ce..329db59 100644
--- a/examples/ggwave-gui/common.cpp
+++ b/examples/ggwave-gui/common.cpp
@@ -10,6 +10,7 @@
 #include <SDL.h>
 
 #include <atomic>
+#include <cmath>
 #include <cstdio>
 #include <string>
 #include <ctime>