diff --git a/src/viewport.cpp b/src/viewport.cpp
index d356165e6b..6ec83cb0f0 100644
--- a/src/viewport.cpp
+++ b/src/viewport.cpp
@@ -3237,8 +3237,8 @@ static void CheckOverflow(int &test, int &other, int max, int mult)
 	test = max;
 }
 
-// static const uint X_DIRS = (1 << DIR_NE) | (1 << DIR_SW);
-// static const uint Y_DIRS = (1 << DIR_SE) | (1 << DIR_NW);
+static const uint X_DIRS = (1 << DIR_NE) | (1 << DIR_SW);
+static const uint Y_DIRS = (1 << DIR_SE) | (1 << DIR_NW);
 static const uint HORZ_DIRS = (1 << DIR_W) | (1 << DIR_E);
 // static const uint VERT_DIRS = (1 << DIR_N) | (1 << DIR_S);