1 files changed, 1 insertions, 1 deletions
diff --git a/penrose.c b/penrose.c
index df0b72e..6ae9756 100644
--- a/penrose.c
+++ b/penrose.c
@@ -9,7 +9,7 @@
 
 #include <assert.h>
 #include <string.h>
-#include <math.h>
+#include <tgmath.h>
 #include <stdio.h>
 
 #include "puzzles.h" /* for malloc routines, and PI */