diff --git a/source/blender/blenkernel/intern/constraint.c b/source/blender/blenkernel/intern/constraint.c
index 88ae02cd418..f60e39769a2 100644
--- a/source/blender/blenkernel/intern/constraint.c
+++ b/source/blender/blenkernel/intern/constraint.c
@@ -1104,9 +1104,9 @@ static void vectomat (float *vec, float *target_up, short axis, short upflag, sh
 	/* identity matrix - don't do anything if the two axes are the same */
 	else {
 		m[0][0]= m[1][1]= m[2][2]= 1.0;
-		m[0][1]= m[0][2]= m[0][3]= 0.0;
-		m[1][0]= m[1][2]= m[1][3]= 0.0;
-		m[2][0]= m[2][1]= m[2][3]= 0.0;
+		m[0][1]= m[0][2]= 0.0;
+		m[1][0]= m[1][2]= 0.0;
+		m[2][0]= m[2][1]= 0.0;
 	}
 }