diff --git a/mozilla/themes/modern/Makefile.in b/mozilla/themes/modern/Makefile.in
index 85a5ab2351c..0e6fc5b66ef 100644
--- a/mozilla/themes/modern/Makefile.in
+++ b/mozilla/themes/modern/Makefile.in
@@ -42,12 +42,10 @@ topsrcdir	= @top_srcdir@
 srcdir		= @srcdir@
 VPATH		= @srcdir@
 
-# XXX Remove this ifdef once SeaMonkey becomes a full XUL app.
-ifndef MOZ_XUL_APP
-
 include $(DEPTH)/config/autoconf.mk
 
-else
+# XXX Remove this ifdef once SeaMonkey becomes a full XUL app.
+ifdef MOZ_XUL_APP
 
 USE_EXTENSION_MANIFEST = 1