1 files changed, 1 insertions, 0 deletions
diff --git a/src/background.c b/src/background.c
index 48501c1..b001812 100644
--- a/src/background.c
+++ b/src/background.c
@@ -3,6 +3,7 @@
 #include "rotrect.h"
 #include "game.h"
 #include <math.h>
+#include <stddef.h>
 
 double tick = 0;