diff --git a/t/perf/perf-lib.sh b/t/perf/perf-lib.sh
index 169f92eae3..b15ee1d262 100644
--- a/t/perf/perf-lib.sh
+++ b/t/perf/perf-lib.sh
@@ -32,6 +32,10 @@ TEST_NO_MALLOC_CHECK=t
 if test -z "$GIT_TEST_INSTALLED"; then
 	perf_results_prefix=
 else
+	if test -n "$GIT_PERF_DIR_MYDIR_REL"
+	then
+		GIT_TEST_INSTALLED=$GIT_PERF_DIR_MYDIR_REL
+	fi
 	perf_results_prefix=$(printf "%s" "${GIT_TEST_INSTALLED%/bin-wrappers}" | tr -c "[a-zA-Z0-9]" "[_*]")"."
 	GIT_TEST_INSTALLED=$ABSOLUTE_GIT_TEST_INSTALLED
 fi
diff --git a/t/perf/run b/t/perf/run
index 9aaa733c77..0a7c8744ab 100755
--- a/t/perf/run
+++ b/t/perf/run
@@ -91,10 +91,14 @@ run_dirs_helper () {
 	if test "$mydir" = .; then
 		unset GIT_TEST_INSTALLED
 	else
-		GIT_TEST_INSTALLED="$mydir/bin-wrappers"
+		GIT_PERF_DIR_MYDIR_REL=$mydir
+		GIT_PERF_DIR_MYDIR_ABS=$(cd $mydir && pwd)
+		export GIT_PERF_DIR_MYDIR_REL GIT_PERF_DIR_MYDIR_ABS
+
+		GIT_TEST_INSTALLED="$GIT_PERF_DIR_MYDIR_ABS/bin-wrappers"
 		# Older versions of git lacked bin-wrappers; fallback to the
 		# files in the root.
-		test -d "$GIT_TEST_INSTALLED" || GIT_TEST_INSTALLED=$mydir
+		test -d "$GIT_TEST_INSTALLED" || GIT_TEST_INSTALLED=$GIT_PERF_DIR_MYDIR_ABS
 		export GIT_TEST_INSTALLED
 	fi
 	run_one_dir "$@"