1 files changed, 1 insertions, 1 deletions
diff --git a/lightup.c b/lightup.c
index 0cead04..816dd70 100644
--- a/lightup.c
+++ b/lightup.c
@@ -48,7 +48,7 @@
 #include <assert.h>
 #include <ctype.h>
 #include <limits.h>
-#include <math.h>
+#include <tgmath.h>
 
 #include "puzzles.h"