diff --git a/src/common/Memoizer.cpp b/src/common/Memoizer.cpp
index 792c2c13f..cfde69743 100644
--- a/src/common/Memoizer.cpp
+++ b/src/common/Memoizer.cpp
@@ -18,6 +18,7 @@
 * 3. This notice may not be removed or altered from any source distribution.
 **/
 #include "Memoizer.h"
+#include <cstddef>
 
 namespace love
 {