--- a/pmc/cube.cc
+++ b/pmc/cube.cc
@@ -32,12 +32,12 @@
 
 void Cube::move (Vector location)
 {
-	Vector *p_tmp;
+    Vector *p_tmp;
 
     for (int i = 0; i < 8; i++) {
         p_tmp = new Vector (*P[i] + location);
-		delete P[i];
-		P[i] = p_tmp;
+        delete P[i];
+        P[i] = p_tmp;
     }
 }