diff --git a/src/Gui/ExpressionBinding.cpp b/src/Gui/ExpressionBinding.cpp
index f4ec86ef0..e6719ce18 100644
--- a/src/Gui/ExpressionBinding.cpp
+++ b/src/Gui/ExpressionBinding.cpp
@@ -172,6 +172,7 @@ bool ExpressionBinding::apply()
     Property * prop(path.getProperty());
 
     assert(prop != 0);
+    Q_UNUSED(prop);
 
     DocumentObject * docObj(path.getDocumentObject());