1 files changed, 1 insertions, 1 deletions
diff --git a/keen.c b/keen.c
index a414129..5624865 100644
--- a/keen.c
+++ b/keen.c
@@ -8,7 +8,7 @@
 #include <string.h>
 #include <assert.h>
 #include <ctype.h>
-#include <math.h>
+#include <tgmath.h>
 
 #include "puzzles.h"
 #include "latin.h"