diff --git a/src/sdl/rect.cpp b/src/sdl/rect.cpp
index ae533efe1da..71705ea2410 100644
--- a/src/sdl/rect.cpp
+++ b/src/sdl/rect.cpp
@@ -16,6 +16,7 @@
 #include "sdl/point.hpp"
 #include "sdl/rect.hpp"
 
+#include <cmath>
 #include <algorithm>
 #include <ostream>