1 files changed, 1 insertions, 1 deletions
diff --git a/loopy.c b/loopy.c
index fd86296..b7d91de 100644
--- a/loopy.c
+++ b/loopy.c
@@ -77,7 +77,7 @@
 #include <string.h>
 #include <assert.h>
 #include <ctype.h>
-#include <math.h>
+#include <tgmath.h>
 
 #include "puzzles.h"
 #include "tree234.h"