diff --git a/app-emacs/ebuild-mode/ebuild-mode-1.51.ebuild b/app-emacs/ebuild-mode/ebuild-mode-1.51-r1.ebuild
similarity index 100%
rename from app-emacs/ebuild-mode/ebuild-mode-1.51.ebuild
rename to app-emacs/ebuild-mode/ebuild-mode-1.51-r1.ebuild
diff --git a/app-emacs/ebuild-mode/files/50ebuild-mode-gentoo-1.51.el b/app-emacs/ebuild-mode/files/50ebuild-mode-gentoo-1.51.el
index c6cb86552d56c..c21721137e41c 100644
--- a/app-emacs/ebuild-mode/files/50ebuild-mode-gentoo-1.51.el
+++ b/app-emacs/ebuild-mode/files/50ebuild-mode-gentoo-1.51.el
@@ -12,7 +12,7 @@
 	       . gentoo-newsitem-mode))
 (add-to-list 'auto-mode-alist '("/glep.*\\.rst\\'" . glep-mode))
 (add-to-list 'auto-mode-alist
-	     '("/\\(package\\.\\(use\\|env\
+	     '("/\\(package\\.\\(mask\\|unmask\\|use\\|env\
 \\|license\\|properties\\|accept_\\(keywords\\|restrict\\)\\)\
 \\|\\(package\\.\\)?use.\\(stable\\.\\)?\\(force\\|mask\\)\\)\\'"
 	       . conf-mode))