diff --git a/effects.cpp b/effects.cpp
index c9af32bb46..cad8b7ae4e 100644
--- a/effects.cpp
+++ b/effects.cpp
@@ -1037,7 +1037,7 @@ bool EffectsHandlerImpl::loadEffect( const QString& name )
     assert( current_build_quads == 0 );
     assert( current_transform == 0 );
 
-    if( !name.startsWith("kwin4_effect_") )
+    if( !name.startsWith(QLatin1String("kwin4_effect_")) )
         kWarning( 1212 ) << "Effect names usually have kwin4_effect_ prefix" ;
 
     // Make sure a single effect won't be loaded multiple times
diff --git a/lib/kdecoration_plugins_p.cpp b/lib/kdecoration_plugins_p.cpp
index 2d764b57a0..0c5fcbe3c1 100644
--- a/lib/kdecoration_plugins_p.cpp
+++ b/lib/kdecoration_plugins_p.cpp
@@ -110,7 +110,7 @@ bool KDecorationPlugins::loadPlugin( QString nameStr )
         nameStr = group.readEntry("PluginLib", defaultPlugin );
         }
     // make sure people can switch between HEAD and kwin_iii branch
-    if( nameStr.startsWith( "kwin_" ))
+    if( nameStr.startsWith( QLatin1String("kwin_") ))
 	nameStr = "kwin3_" + nameStr.mid( 5 );
 
     KLibrary *oldLibrary = library;