diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
index 0bb74c05e52..8fc01fb4971 100755
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -939,7 +939,7 @@ _git_log ()
 	local cur="${COMP_WORDS[COMP_CWORD]}"
 	local g="$(git rev-parse --git-dir 2>/dev/null)"
 	local merge=""
-	if [ -f $g/MERGE_HEAD ]; then
+	if [ -f "$g/MERGE_HEAD" ]; then
 		merge="--merge"
 	fi
 	case "$cur" in
@@ -1681,7 +1681,7 @@ _gitk ()
 	local cur="${COMP_WORDS[COMP_CWORD]}"
 	local g="$(git rev-parse --git-dir 2>/dev/null)"
 	local merge=""
-	if [ -f $g/MERGE_HEAD ]; then
+	if [ -f "$g/MERGE_HEAD" ]; then
 		merge="--merge"
 	fi
 	case "$cur" in