1 files changed, 5 insertions, 0 deletions
diff --git a/setup.c b/setup.c
index 699fcf096..2c51a9a4c 100644
--- a/setup.c
+++ b/setup.c
@@ -742,6 +742,11 @@ const char *setup_git_directory_gently(int *nongit_ok)
 	const char *prefix;
 
 	prefix = setup_git_directory_gently_1(nongit_ok);
+	if (prefix)
+		setenv("GIT_PREFIX", prefix, 1);
+	else
+		setenv("GIT_PREFIX", "", 1);
+
 	if (startup_info) {
 		startup_info->have_repository = !nongit_ok || !*nongit_ok;
 		startup_info->prefix = prefix;