diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
index 20b8114612..bfc74e9d57 100644
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -739,30 +739,25 @@ __git_compute_porcelain_commands ()
 	__git_porcelain_commands=$(__git_list_porcelain_commands)
 }
 
+# Lists all set config variables starting with the given section prefix,
+# with the prefix removed.
+__git_get_config_variables ()
+{
+	local section="$1" i IFS=$'\n'
+	for i in $(git --git-dir="$(__gitdir)" config --get-regexp "^$section\..*" 2>/dev/null); do
+		i="${i#$section.}"
+		echo "${i/ */}"
+	done
+}
+
 __git_pretty_aliases ()
 {
-	local i IFS=$'\n'
-	for i in $(git --git-dir="$(__gitdir)" config --get-regexp "pretty\..*" 2>/dev/null); do
-		case "$i" in
-		pretty.*)
-			i="${i#pretty.}"
-			echo "${i/ */}"
-			;;
-		esac
-	done
+	__git_get_config_variables "pretty"
 }
 
 __git_aliases ()
 {
-	local i IFS=$'\n'
-	for i in $(git --git-dir="$(__gitdir)" config --get-regexp "alias\..*" 2>/dev/null); do
-		case "$i" in
-		alias.*)
-			i="${i#alias.}"
-			echo "${i/ */}"
-			;;
-		esac
-	done
+	__git_get_config_variables "alias"
 }
 
 # __git_aliased_command requires 1 argument
@@ -2260,12 +2255,7 @@ _git_remote ()
 		__git_complete_remote_or_refspec
 		;;
 	update)
-		local i c='' IFS=$'\n'
-		for i in $(git --git-dir="$(__gitdir)" config --get-regexp "remotes\..*" 2>/dev/null); do
-			i="${i#remotes.}"
-			c="$c ${i/ */}"
-		done
-		__gitcomp "$c"
+		__gitcomp "$(__git_get_config_variables "remotes")"
 		;;
 	*)
 		;;
diff --git a/t/t9902-completion.sh b/t/t9902-completion.sh
index 4a14a5892e..2ba62fbc17 100755
--- a/t/t9902-completion.sh
+++ b/t/t9902-completion.sh
@@ -370,6 +370,40 @@ test_expect_success '__git_remotes - list remotes from $GIT_DIR/remotes and from
 	test_cmp expect actual
 '
 
+test_expect_success '__git_get_config_variables' '
+	cat >expect <<-EOF &&
+	name-1
+	name-2
+	EOF
+	test_config interesting.name-1 good &&
+	test_config interesting.name-2 good &&
+	test_config subsection.interesting.name-3 bad &&
+	__git_get_config_variables interesting >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success '__git_pretty_aliases' '
+	cat >expect <<-EOF &&
+	author
+	hash
+	EOF
+	test_config pretty.author "%an %ae" &&
+	test_config pretty.hash %H &&
+	__git_pretty_aliases >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success '__git_aliases' '
+	cat >expect <<-EOF &&
+	ci
+	co
+	EOF
+	test_config alias.ci commit &&
+	test_config alias.co checkout &&
+	__git_aliases >actual &&
+	test_cmp expect actual
+'
+
 test_expect_success 'basic' '
 	run_completion "git " &&
 	# built-in