diff --git a/window.cpp b/window.cpp
index 4c934172cd6cf1a50cd6680979d5b12503fad567..d590fed7b0d8d99db1abcdfc2dda8b9c076c3e6c 100644
--- a/window.cpp
+++ b/window.cpp
@@ -92,9 +92,9 @@ void Window::solveButtonClicked()
             hist.back().cell->un();
             if (hist.back().index.size() == 0)
             {
-                    hist.pop_back();
-                    continue;
-                }
+                hist.pop_back();
+                continue;
+            }
             backtracking = false;
             int choiceNr = rand() % hist.back().index.size(); // choose a random number;
             repaint();                                         // draw cells again