diff --git a/vcl/source/window/builder.cxx b/vcl/source/window/builder.cxx
index 3f81651e15eb..ad9706cd7339 100644
--- a/vcl/source/window/builder.cxx
+++ b/vcl/source/window/builder.cxx
@@ -1673,7 +1673,7 @@ VclBuilder::customMakeWidget GetCustomMakeWidget(const OString& name)
         SAL_WARN_IF(!pFunction, "vcl.layout", "Could not find " << sFunction);
         assert(pFunction);
 #else
-        pFunction = reinterpret_cast<customMakeWidget>(
+        pFunction = reinterpret_cast<VclBuilder::customMakeWidget>(
             osl_getFunctionSymbol((oslModule)RTLD_DEFAULT, sFunction.pData));
 #endif
     }