diff --git a/Userland/Libraries/LibCore/DirIterator.cpp b/Userland/Libraries/LibCore/DirIterator.cpp
index deb3f17d04..adbc3c1418 100644
--- a/Userland/Libraries/LibCore/DirIterator.cpp
+++ b/Userland/Libraries/LibCore/DirIterator.cpp
@@ -77,7 +77,12 @@ String DirIterator::next_path()
 
 String DirIterator::next_full_path()
 {
-    return String::formatted("{}/{}", m_path, next_path());
+    StringBuilder builder;
+    builder.append(m_path);
+    if (!m_path.ends_with('/'))
+        builder.append('/');
+    builder.append(next_path());
+    return builder.to_string();
 }
 
 String find_executable_in_path(String filename)