diff --git a/application/basilisk/installer/package-manifest.in b/application/basilisk/installer/package-manifest.in
index 5a9a0f929a..6742e835e6 100644
--- a/application/basilisk/installer/package-manifest.in
+++ b/application/basilisk/installer/package-manifest.in
@@ -450,8 +450,8 @@
 @RESPATH@/components/formautofill.manifest
 @RESPATH@/components/FormAutofillContentService.js
 @RESPATH@/components/FormAutofillStartup.js
-@RESPATH@/components/CSSUnprefixingService.js
-@RESPATH@/components/CSSUnprefixingService.manifest
+;@RESPATH@/components/CSSUnprefixingService.js
+;@RESPATH@/components/CSSUnprefixingService.manifest
 @RESPATH@/components/contentAreaDropListener.manifest
 @RESPATH@/components/contentAreaDropListener.js
 @RESPATH@/browser/components/BrowserProfileMigrators.manifest