diff --git a/src/preferences/preferences.h b/src/preferences/preferences.h
index e37e5ad6b..795331799 100755
--- a/src/preferences/preferences.h
+++ b/src/preferences/preferences.h
@@ -1419,7 +1419,7 @@ private:
       delete[] lpValueName;
 
     if (res == ERROR_SUCCESS) {
-      lpData[cBuffer] = 0;
+      lpData[cBuffer - 1] = 0;
       result = QString::fromWCharArray(lpData);
     }
     delete[] lpData;