diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
index c59347daee..f89324d84f 100644
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -2398,7 +2398,15 @@ _git_config ()
 		;;
 	*)
 		__git_compute_config_vars
-		__gitcomp "$(echo "$__git_config_vars" | sed 's/\.[^ ]*/./g')"
+		__gitcomp "$(echo "$__git_config_vars" |
+				awk -F . '{
+					sections[$1] = 1
+				}
+				END {
+					for (s in sections)
+						print s "."
+				}
+				')"
 	esac
 }
 
diff --git a/t/t9902-completion.sh b/t/t9902-completion.sh
index e15be1164d..008fba7c89 100755
--- a/t/t9902-completion.sh
+++ b/t/t9902-completion.sh
@@ -1698,7 +1698,7 @@ do
 	'
 done
 
-test_expect_failure 'git config - section' '
+test_expect_success 'git config - section' '
 	test_completion "git config br" <<-\EOF
 	branch.Z
 	browser.Z