diff --git a/src/preferences/filetypes/ApplicationTypeWindow.cpp b/src/preferences/filetypes/ApplicationTypeWindow.cpp
index f92534cc53..0dcae2d0a3 100644
--- a/src/preferences/filetypes/ApplicationTypeWindow.cpp
+++ b/src/preferences/filetypes/ApplicationTypeWindow.cpp
@@ -331,7 +331,7 @@ ApplicationTypeWindow::ApplicationTypeWindow(BPoint position,
 	// Signature
 
 	fSignatureControl = new BTextControl("signature",
-		B_TRANSLATE("Signature:"), new BMessage(kMsgSignatureChanged));
+		B_TRANSLATE("Signature:"), NULL, new BMessage(kMsgSignatureChanged));
 	fSignatureControl->SetModificationMessage(
 		new BMessage(kMsgSignatureChanged));