diff --git a/slideshow/source/engine/OGLTrans/generic/OGLTrans_TransitionImpl.hxx b/slideshow/source/engine/OGLTrans/generic/OGLTrans_TransitionImpl.hxx
index f1a595efb025..c56e9c95f2af 100644
--- a/slideshow/source/engine/OGLTrans/generic/OGLTrans_TransitionImpl.hxx
+++ b/slideshow/source/engine/OGLTrans/generic/OGLTrans_TransitionImpl.hxx
@@ -48,7 +48,7 @@ struct TransitionSettings
     TransitionSettings() :
         mbUseMipMapLeaving( true ),
         mbUseMipMapEntering( true ),
-        mnRequiredGLVersion( 2.1 )
+        mnRequiredGLVersion( 2.1f )
     {
     }