1 files changed, 1 insertions, 1 deletions
diff --git a/nullgame.c b/nullgame.c
index c539d1b..c5ad0c9 100644
--- a/nullgame.c
+++ b/nullgame.c
@@ -16,7 +16,7 @@
 #include <string.h>
 #include <assert.h>
 #include <ctype.h>
-#include <math.h>
+#include <tgmath.h>
 
 #include "puzzles.h"