diff --git a/AK/BinaryHeap.h b/AK/BinaryHeap.h
index 08d1bbae2f..1fce748366 100644
--- a/AK/BinaryHeap.h
+++ b/AK/BinaryHeap.h
@@ -6,6 +6,8 @@
 
 #pragma once
 
+#include <AK/Types.h>
+
 namespace AK {
 
 template<typename K, typename V, size_t Capacity>
diff --git a/AK/HashTable.h b/AK/HashTable.h
index b075853b6e..b50d4486d5 100644
--- a/AK/HashTable.h
+++ b/AK/HashTable.h
@@ -9,6 +9,7 @@
 #include <AK/Forward.h>
 #include <AK/HashFunctions.h>
 #include <AK/StdLibExtras.h>
+#include <AK/Traits.h>
 #include <AK/Types.h>
 #include <AK/kmalloc.h>
 
diff --git a/AK/IntrusiveDetails.h b/AK/IntrusiveDetails.h
index 7cf9a04093..180979b373 100644
--- a/AK/IntrusiveDetails.h
+++ b/AK/IntrusiveDetails.h
@@ -6,6 +6,8 @@
 
 #pragma once
 
+#include <AK/NonnullRefPtr.h>
+
 namespace AK::Detail {
 
 template<typename T, typename Container>
diff --git a/AK/StringHash.h b/AK/StringHash.h
index 7b01b48bba..1e28c8426d 100644
--- a/AK/StringHash.h
+++ b/AK/StringHash.h
@@ -6,6 +6,8 @@
 
 #pragma once
 
+#include <AK/Types.h>
+
 namespace AK {
 
 constexpr u32 string_hash(char const* characters, size_t length)