diff --git a/lib/kwineffects.cpp b/lib/kwineffects.cpp
index 30749a2bfa..d6152d2e93 100644
--- a/lib/kwineffects.cpp
+++ b/lib/kwineffects.cpp
@@ -500,6 +500,8 @@ bool EffectsHandler::checkDriverBlacklist( const KConfigGroup& blacklist )
         {
         QString vendor   = QString((const char*)glGetString( GL_VENDOR ));
         QString renderer = QString((const char*)glGetString( GL_RENDERER ));
+        renderer.append( ":-:" );
+        renderer.append((const char*)glGetString( GL_VERSION ));
         foreach( const QString& key, blacklist.keyList() )
             {
             // the key is a word in the renderer string or vendor referrencing the vendor in case of mesa
diff --git a/lib/kwineffects.h b/lib/kwineffects.h
index 1787131fa2..ab60d7b602 100644
--- a/lib/kwineffects.h
+++ b/lib/kwineffects.h
@@ -793,7 +793,8 @@ class KWIN_EXPORT EffectsHandler
         /**
          * Checks if the driver is on given blacklist.
          * The format of the blacklist is driver identifier as key (e.g. Intel) with a list of
-         * concrete driver render strings as the values.
+         * concrete driver render strings as the values. The renderer string consists of GL_RENDERER
+         * and GL_VERSION separated by colon dash colon. E.g.: GeForce 9400M/PCI/SSE2:-:3.2.0 NVIDIA 195.36.24
          * This method is only used for OpenGL compositing. If not using OpenGL it will return false.
          * @returns true if the driver is blacklisted, false otherwise
          * @since 4.5