diff --git a/AK/StringBuilder.cpp b/AK/StringBuilder.cpp
index fda01d6e79..0a363a5355 100644
--- a/AK/StringBuilder.cpp
+++ b/AK/StringBuilder.cpp
@@ -21,10 +21,11 @@ inline void StringBuilder::will_append(size_t size)
     Checked<size_t> needed_capacity = m_length;
     needed_capacity += size;
     VERIFY(!needed_capacity.has_overflow());
+    // Prefer to completely use the existing capacity first
+    if (needed_capacity <= m_buffer.capacity())
+        return;
     Checked<size_t> expanded_capacity = needed_capacity;
-    // Prefer to completely use the inline buffer first
-    if (needed_capacity > inline_capacity)
-        expanded_capacity *= 2;
+    expanded_capacity *= 2;
     VERIFY(!expanded_capacity.has_overflow());
     m_buffer.ensure_capacity(expanded_capacity.value());
 }