diff --git a/python/GafferUI/PlugPopup.py b/python/GafferUI/PlugPopup.py
index e26c2444e8a..a7c9f0849e6 100644
--- a/python/GafferUI/PlugPopup.py
+++ b/python/GafferUI/PlugPopup.py
@@ -165,13 +165,11 @@ def widgetUsable( w ) :
 
 		widget = None
 
-		if isinstance( plugValueWidget, GafferUI.StringPlugValueWidget ) :
-			widget = plugValueWidget.textWidget()
-		elif isinstance( plugValueWidget, GafferUI.NumericPlugValueWidget ) :
+		if isinstance( plugValueWidget, GafferUI.NumericPlugValueWidget ) :
 			widget = plugValueWidget.numericWidget()
 		elif isinstance( plugValueWidget, GafferUI.PathPlugValueWidget ) :
 			widget = plugValueWidget.pathWidget()
-		elif isinstance( plugValueWidget, GafferUI.MultiLineStringPlugValueWidget ) :
+		elif hasattr( plugValueWidget, "textWidget" ) :
 			widget = plugValueWidget.textWidget()
 
 		if widget is not None and widgetUsable( widget ) :