1 files changed, 1 insertions, 1 deletions
diff --git a/galaxies.c b/galaxies.c
index 10c92d8..e3cc76e 100644
--- a/galaxies.c
+++ b/galaxies.c
@@ -80,7 +80,7 @@
 #include <assert.h>
 #include <ctype.h>
 #include <limits.h>
-#include <math.h>
+#include <tgmath.h>
 
 #include "puzzles.h"