1 files changed, 1 insertions, 1 deletions
diff --git a/hat.c b/hat.c
index 0a2dd21..99babcc 100644
--- a/hat.c
+++ b/hat.c
@@ -12,7 +12,7 @@
  */
 
 #include <assert.h>
-#include <math.h>
+#include <tgmath.h>
 #include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>