diff --git a/puzz.h b/puzz.h
index e31387f..5a052ba 100644
--- a/puzz.h
+++ b/puzz.h
@@ -6,8 +6,8 @@
 #ifndef PUZZ_H
 #define PUZZ_H
 
-#define WIDTH 10
-#define HEIGHT 10
+#define WIDTH 9
+#define HEIGHT 9
 #define NMINES 10
 
 #include <stdint.h>