diff --git a/contrib/dockerlib.sh b/contrib/dockerlib.sh
--- a/contrib/dockerlib.sh
+++ b/contrib/dockerlib.sh
@@ -38,5 +38,5 @@
         echo RUN groupadd $DBUILDUSER -g `id -g` -o
         echo RUN useradd $DBUILDUSER -u `id -u` -g $DBUILDUSER -o
     fi
-  ) | $DOCKER build --tag $CONTAINER -
+  ) | $DOCKER build --build-arg http_proxy --build-arg https_proxy --tag $CONTAINER -
 }
diff --git a/contrib/dockerrpm b/contrib/dockerrpm
--- a/contrib/dockerrpm
+++ b/contrib/dockerrpm
@@ -16,10 +16,10 @@
 contrib/buildrpm --rpmbuilddir $RPMBUILDDIR --prepare $*
 
 DSHARED=/mnt/shared
-$DOCKER run -u $DBUILDUSER --rm -v $RPMBUILDDIR:$DSHARED $CONTAINER \
+$DOCKER run -e http_proxy -e https_proxy -u $DBUILDUSER --rm -v $RPMBUILDDIR:$DSHARED $CONTAINER \
     rpmbuild --define "_topdir $DSHARED" -ba $DSHARED/SPECS/mercurial.spec --clean
 
-$DOCKER run -u $DBUILDUSER --rm -v $RPMBUILDDIR:$DSHARED $CONTAINER \
+$DOCKER run -e http_proxy -e https_proxy -u $DBUILDUSER --rm -v $RPMBUILDDIR:$DSHARED $CONTAINER \
     createrepo $DSHARED
 
 cat << EOF > $RPMBUILDDIR/mercurial.repo