diff --git a/klineal.cpp b/klineal.cpp
--- a/klineal.cpp
+++ b/klineal.cpp
@@ -392,7 +392,13 @@
 
 void KLineal::centerOrigin()
 {
-  mOffset = -( length() / 2 );
+  int centerOffset = -length() / 2;
+  if (mOffset == centerOffset) {
+    // centered already, go back to normal
+    mOffset = 0;
+  } else {
+    mOffset = centerOffset;
+  }
   repaint();
   saveSettings();
 }