1 files changed, 1 insertions, 1 deletions
diff --git a/tracks.c b/tracks.c
index 6b882e9..151f7fb 100644
--- a/tracks.c
+++ b/tracks.c
@@ -21,7 +21,7 @@
 #include <assert.h>
 #include <ctype.h>
 #include <limits.h>
-#include <math.h>
+#include <tgmath.h>
 
 #include "puzzles.h"