diff --git a/toolkit/mozapps/installer/packager.mk b/toolkit/mozapps/installer/packager.mk
index cbc375ecc08d..d9795ccfcc80 100644
--- a/toolkit/mozapps/installer/packager.mk
+++ b/toolkit/mozapps/installer/packager.mk
@@ -55,8 +55,12 @@ else
 ifeq (,$(filter-out SunOS, $(OS_ARCH)))
 MOZ_PKG_FORMAT  = BZ2
 else
+ifeq ($(MOZ_WIDGET_TOOLKIT),gtk2)
+MOZ_PKG_FORMAT  = BZ2
+else
 MOZ_PKG_FORMAT  = TGZ
 endif
+endif
 INSTALLER_DIR   = unix
 endif
 endif