diff --git a/AK/StringImpl.cpp b/AK/StringImpl.cpp
index c46ff2ae6c4..b7639b11eee 100644
--- a/AK/StringImpl.cpp
+++ b/AK/StringImpl.cpp
@@ -5,6 +5,7 @@
  */
 
 #include <AK/FlyString.h>
+#include <AK/HashTable.h>
 #include <AK/Memory.h>
 #include <AK/StdLibExtras.h>
 #include <AK/StringHash.h>