diff --git a/t/lib-midx.sh b/t/lib-midx.sh
index e38c609604..b522dbdb0f 100644
--- a/t/lib-midx.sh
+++ b/t/lib-midx.sh
@@ -34,3 +34,9 @@ compare_results_with_midx () {
 		midx_git_two_modes "cat-file --batch-all-objects --batch-check --unordered" sorted
 	'
 }
+
+nth_line() {
+	local n="$1"
+	shift
+	awk "NR==$n" "$@"
+}
diff --git a/t/t5335-compact-multi-pack-index.sh b/t/t5335-compact-multi-pack-index.sh
index ec1dafe89f..6a4b799b9c 100755
--- a/t/t5335-compact-multi-pack-index.sh
+++ b/t/t5335-compact-multi-pack-index.sh
@@ -3,6 +3,7 @@
 test_description='multi-pack-index compaction'
 
 . ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-midx.sh
 
 GIT_TEST_MULTI_PACK_INDEX=0
 GIT_TEST_MULTI_PACK_INDEX_WRITE_BITMAP=0
@@ -13,12 +14,6 @@ packdir=$objdir/pack
 midxdir=$packdir/multi-pack-index.d
 midx_chain=$midxdir/multi-pack-index-chain
 
-nth_line() {
-	local n="$1"
-	shift
-	awk "NR==$n" "$@"
-}
-
 write_packs () {
 	for c in "$@"
 	do