1 files changed, 1 insertions, 1 deletions

diff --git a/rect.c b/rect.c
index 1dffacb..40bc846 100644
--- a/rect.c
+++ b/rect.c
@@ -26,7 +26,7 @@
 #include <string.h>
 #include <assert.h>
 #include <ctype.h>
-#include <math.h>
+#include <tgmath.h>
 
 #include "puzzles.h"