diff --git a/krusader/krslots.cpp b/krusader/krslots.cpp
--- a/krusader/krslots.cpp
+++ b/krusader/krslots.cpp
@@ -173,7 +173,7 @@
         name2 = ACTIVE_PANEL->otherPanel()->func->files()->getUrl(ACTIVE_VIEW->getCurrentItem());
     } else  {
         // if we got here, then we can't be sure what file to diff
-        KMessageBox::detailedError(0, i18n("Do not know which files to compare."), "<qt>" + i18n("To compare two files by content, you can either:<ul><li>Select one file in the left panel, and one in the right panel.</li><li>Select exactly two files in the active panel.</li><li>Make sure there is a file in the other panel, with the same name as the current file in the active panel.</li></ul>") + "</qt>");
+        KMessageBox::sorry(0, "<qt>" + i18n("Do not know which files to compare.") + "<br/><br/>" + i18n("To compare two files by content, you can either:<ul><li>Select one file in the left panel, and one in the right panel.</li><li>Select exactly two files in the active panel.</li><li>Make sure there is a file in the other panel, with the same name as the current file in the active panel.</li></ul>") + "</qt>");
 
         return;
     }