--- a/browser/base/content/test/Makefile.in
+++ b/browser/base/content/test/Makefile.in
@@ -142,17 +142,16 @@ endif
                  browser_discovery.js \
                  browser_drag.js \
                  browser_gestureSupport.js \
                  browser_getshortcutoruri.js \
                  browser_inspector_initialization.js \
                  browser_inspector_treeSelection.js \
                  browser_inspector_highlighter.js \
                  browser_inspector_stylePanel.js \
-                 browser_overflowScroll.js \
                  browser_pageInfo.js \
                  browser_page_style_menu.js \
                  browser_pinnedTabs.js \
                  browser_plainTextLinks.js \
                  browser_pluginnotification.js \
                  browser_popupUI.js \
                  browser_relatedTabs.js \
                  browser_sanitize-passwordDisabledHosts.js \
@@ -177,18 +176,28 @@ endif
                  zoom_test.html \
                  dummy_page.html \
                  browser_tabMatchesInAwesomebar.js \
                  file_bug550565_popup.html \
                  file_bug550565_favicon.ico \
     $(NULL)
 
 ifneq (cocoa,$(MOZ_WIDGET_TOOLKIT))
-_BROWSER_FILES += browser_bug462289.js
+_BROWSER_FILES += \
+		browser_bug462289.js \
+		$(NULL)
 else
-_BROWSER_FILES += browser_customize.js
+_BROWSER_FILES += \
+		browser_customize.js \
+		$(NULL)
+endif
+
+ifneq (gtk2,$(MOZ_WIDGET_TOOLKIT))
+_BROWSER_FILES += \
+		browser_overflowScroll.js \
+		$(NULL)
 endif
 
 libs:: $(_TEST_FILES)
 	$(INSTALL) $(foreach f,$^,"$f") $(DEPTH)/_tests/testing/mochitest/tests/$(relativesrcdir)
 
 libs::	$(_BROWSER_FILES)
 	$(INSTALL) $(foreach f,$^,"$f") $(DEPTH)/_tests/testing/mochitest/browser/$(relativesrcdir)