1 files changed, 1 insertions, 1 deletions
diff --git a/unequal.c b/unequal.c
index 9c75d51..f50197b 100644
--- a/unequal.c
+++ b/unequal.c
@@ -21,7 +21,7 @@
 #include <string.h>
 #include <assert.h>
 #include <ctype.h>
-#include <math.h>
+#include <tgmath.h>
 
 #include "puzzles.h"
 #include "latin.h" /* contains typedef for digit */