diff --git a/bin/git-create-branch b/bin/git-create-branch
index c94d0a0..c0d1dd4 100755
--- a/bin/git-create-branch
+++ b/bin/git-create-branch
@@ -37,10 +37,11 @@ test -z $BRANCH && echo "branch argument required." 1>&2 && exit 1
 
 if [[ -n $REMOTE ]]
 then
-	git ls-remote --exit-code $REMOTE 1>/dev/null 2>/tmp/ls-remote-error
+	stderr=$(git_extra_mktemp)
+	git ls-remote --exit-code $REMOTE 1>/dev/null 2>"$stderr"
 	REMOTE_EXIT=$?
-	REMOTE_ERROR=$(</tmp/ls-remote-error)
-	rm -f /tmp/ls-remote-error
+	REMOTE_ERROR=$(<"$stderr")
+	rm -f "$stderr"
 	if [ $REMOTE_EXIT -eq 0 ]
 	then
 		git push $REMOTE HEAD:refs/heads/$BRANCH
diff --git a/install.sh b/install.sh
index 9fda0e0..f705073 100755
--- a/install.sh
+++ b/install.sh
@@ -9,13 +9,14 @@ make_install() {
     fi
 }
 
-cd /tmp \
-    && rm -rf ./git-extras \
+dir=$(mktemp -t -d git-extras-install.XXXXXXXXXX) \
+    && cd "$dir" \
     && echo "Setting up 'git-extras'...." \
     && git clone https://github.com/tj/git-extras.git &> /dev/null \
     && cd git-extras \
     && git checkout \
         $(git describe --tags $(git rev-list --tags --max-count=1)) \
         &> /dev/null \
-    && make_install
+    && make_install \
+    && rm -rf "$dir"