--- a/build/mozconfig.cache
+++ b/build/mozconfig.cache
@@ -55,17 +55,17 @@ else
     case "$master" in
     *use1.mozilla.com*|*usw2.mozilla.com*)
         mk_add_options "export SCCACHE_NAMESERVER=169.254.169.253"
         ;;
     esac
     ac_add_options "--with-compiler-wrapper=python2.7 $topsrcdir/sccache/sccache.py"
     mk_add_options MOZ_PREFLIGHT_ALL+=build/sccache.mk
     mk_add_options MOZ_POSTFLIGHT_ALL+=build/sccache.mk
-    mk_add_options "export UPLOAD_EXTRA_FILES+=sccache.log.gz"
+    mk_add_options "UPLOAD_EXTRA_FILES+=sccache.log.gz"
     case "$platform" in
     win*)
         # sccache supports a special flag to create depfiles.
         export _DEPEND_CFLAGS='-deps$(MDDEPDIR)/$(@F).pp'
         # Windows builds have a default wrapper that needs to be overridden
         mk_add_options "export CC_WRAPPER="
         mk_add_options "export CXX_WRAPPER="
         # For now, sccache doesn't support separate PDBs so force debug info to be