diff --git a/AK/LexicalPath.cpp b/AK/LexicalPath.cpp
index 4f18a8f8d5..c50fc56b9e 100644
--- a/AK/LexicalPath.cpp
+++ b/AK/LexicalPath.cpp
@@ -171,8 +171,25 @@ DeprecatedString LexicalPath::relative_path(StringView a_path, StringView a_pref
         return path.substring_view(prefix.length() + 1);
     }
 
-    // FIXME: It's still possible to generate a relative path in this case, it just needs some "..".
-    return path;
+    auto path_parts = path.split_view('/');
+    auto prefix_parts = prefix.split_view('/');
+    size_t index_of_first_part_that_differs = 0;
+    for (; index_of_first_part_that_differs < path_parts.size() && index_of_first_part_that_differs < prefix_parts.size(); index_of_first_part_that_differs++) {
+        if (path_parts[index_of_first_part_that_differs] != prefix_parts[index_of_first_part_that_differs])
+            break;
+    }
+
+    StringBuilder builder;
+    for (size_t part_index = index_of_first_part_that_differs; part_index < prefix_parts.size(); part_index++) {
+        builder.append("../"sv);
+    }
+    for (size_t part_index = index_of_first_part_that_differs; part_index < path_parts.size(); part_index++) {
+        builder.append(path_parts[part_index]);
+        if (part_index != path_parts.size() - 1) // We don't need a slash after the file name or the name of the last directory
+            builder.append('/');
+    }
+
+    return builder.to_deprecated_string();
 }
 
 LexicalPath LexicalPath::append(StringView value) const
diff --git a/Tests/AK/TestLexicalPath.cpp b/Tests/AK/TestLexicalPath.cpp
index 29574049b2..23875af3d9 100644
--- a/Tests/AK/TestLexicalPath.cpp
+++ b/Tests/AK/TestLexicalPath.cpp
@@ -15,10 +15,12 @@ TEST_CASE(relative_path)
     EXPECT_EQ(LexicalPath::relative_path("/tmp/abc.txt"sv, "/tmp"sv), "abc.txt"sv);
     EXPECT_EQ(LexicalPath::relative_path("/tmp/abc.txt"sv, "/tmp/"sv), "abc.txt"sv);
     EXPECT_EQ(LexicalPath::relative_path("/tmp/abc.txt"sv, "/"sv), "tmp/abc.txt"sv);
-    EXPECT_EQ(LexicalPath::relative_path("/tmp/abc.txt"sv, "/usr"sv), "/tmp/abc.txt"sv);
+    EXPECT_EQ(LexicalPath::relative_path("/tmp/abc.txt"sv, "/usr"sv), "../tmp/abc.txt"sv);
 
     EXPECT_EQ(LexicalPath::relative_path("/tmp/foo.txt"sv, "tmp"sv), ""sv);
     EXPECT_EQ(LexicalPath::relative_path("tmp/foo.txt"sv, "/tmp"sv), ""sv);
+
+    EXPECT_EQ(LexicalPath::relative_path("/tmp/foo/bar/baz.txt"sv, "/tmp/bar/foo/"sv), "../../foo/bar/baz.txt"sv);
 }
 
 TEST_CASE(regular_absolute_path)