1 files changed, 1 insertions, 1 deletions
diff --git a/loopgen.c b/loopgen.c
index e738d4a..d8f5e27 100644
--- a/loopgen.c
+++ b/loopgen.c
@@ -8,7 +8,7 @@
 #include <string.h>
 #include <assert.h>
 #include <ctype.h>
-#include <math.h>
+#include <tgmath.h>
 
 #include "puzzles.h"
 #include "tree234.h"