diff --git a/kstyle/breezestyle.cpp b/kstyle/breezestyle.cpp
--- a/kstyle/breezestyle.cpp
+++ b/kstyle/breezestyle.cpp
@@ -5236,7 +5236,11 @@
     {
 
         // cast option and check
+        #if BREEZE_USE_KDE4
         const auto frameOpt = qstyleoption_cast<const QStyleOptionFrameV3*>( option );
+        #else
+        const auto frameOpt = qstyleoption_cast<const QStyleOptionFrame*>( option );
+        #endif
         if( !frameOpt ) return false;
 
         switch( frameOpt->frameShape )