diff --git a/name-hash.c b/name-hash.c
index ada66f066a..163849831c 100644
--- a/name-hash.c
+++ b/name-hash.c
@@ -699,12 +699,12 @@ void adjust_dirname_case(struct index_state *istate, char *name)
 		if (*ptr == '/') {
 			struct dir_entry *dir;
 
-			ptr++;
-			dir = find_dir_entry(istate, name, ptr - name + 1);
+			dir = find_dir_entry(istate, name, ptr - name);
 			if (dir) {
 				memcpy((void *)startPtr, dir->name + (startPtr - name), ptr - startPtr);
-				startPtr = ptr;
+				startPtr = ptr + 1;
 			}
+			ptr++;
 		}
 	}
 }
diff --git a/t/t0050-filesystem.sh b/t/t0050-filesystem.sh
index b29d749bb7..192c94eccd 100755
--- a/t/t0050-filesystem.sh
+++ b/t/t0050-filesystem.sh
@@ -80,7 +80,21 @@ test_expect_success 'merge (case change)' '
 	git merge topic
 '
 
-
+test_expect_success CASE_INSENSITIVE_FS 'add directory (with different case)' '
+	git reset --hard initial &&
+	mkdir -p dir1/dir2 &&
+	echo >dir1/dir2/a &&
+	echo >dir1/dir2/b &&
+	git add dir1/dir2/a &&
+	git add dir1/DIR2/b &&
+	git ls-files >actual &&
+	cat >expected <<-\EOF &&
+		camelcase
+		dir1/dir2/a
+		dir1/dir2/b
+	EOF
+	test_cmp expected actual
+'
 
 test_expect_failure CASE_INSENSITIVE_FS 'add (with different case)' '
 	git reset --hard initial &&