diff --git a/examples/image.cc b/examples/image.cc
index 9186785..105b42b 100644
--- a/examples/image.cc
+++ b/examples/image.cc
@@ -19,6 +19,7 @@
   3. This notice may not be removed or altered from any source distribution.
 */
 
+#include <cmath>
 #include <iostream>
 
 #include <SDL2/SDL.h>