diff --git a/Libraries/LibCore/HttpJob.h b/Libraries/LibCore/HttpJob.h
index 5c8203f906..2c78386dc9 100644
--- a/Libraries/LibCore/HttpJob.h
+++ b/Libraries/LibCore/HttpJob.h
@@ -33,8 +33,6 @@
 
 namespace Core {
 
-class TCPSocket;
-
 class HttpJob final : public NetworkJob {
     C_OBJECT(HttpJob)
 public:
diff --git a/Libraries/LibCore/HttpRequest.h b/Libraries/LibCore/HttpRequest.h
index b707ae22ef..f3420964cf 100644
--- a/Libraries/LibCore/HttpRequest.h
+++ b/Libraries/LibCore/HttpRequest.h
@@ -29,11 +29,11 @@
 #include <AK/Optional.h>
 #include <AK/String.h>
 #include <AK/URL.h>
+#include <AK/Vector.h>
+#include <LibCore/Forward.h>
 
 namespace Core {
 
-class NetworkJob;
-
 class HttpRequest {
 public:
     enum Method {
diff --git a/Libraries/LibCore/LocalServer.h b/Libraries/LibCore/LocalServer.h
index bd26d75dd3..bcb4fa6c00 100644
--- a/Libraries/LibCore/LocalServer.h
+++ b/Libraries/LibCore/LocalServer.h
@@ -31,8 +31,6 @@
 
 namespace Core {
 
-class LocalSocket;
-
 class LocalServer : public Object {
     C_OBJECT(LocalServer)
 public:
diff --git a/Libraries/LibCore/LocalSocket.h b/Libraries/LibCore/LocalSocket.h
index 7d504cdae4..1feee980f5 100644
--- a/Libraries/LibCore/LocalSocket.h
+++ b/Libraries/LibCore/LocalSocket.h
@@ -30,8 +30,6 @@
 
 namespace Core {
 
-class LocalServer;
-
 class LocalSocket final : public Socket {
     C_OBJECT(LocalSocket)
 public:
diff --git a/Libraries/LibCore/NetworkJob.h b/Libraries/LibCore/NetworkJob.h
index e808ddc434..c637570ab0 100644
--- a/Libraries/LibCore/NetworkJob.h
+++ b/Libraries/LibCore/NetworkJob.h
@@ -31,8 +31,6 @@
 
 namespace Core {
 
-class NetworkResponse;
-
 class NetworkJob : public Object {
     C_OBJECT_ABSTRACT(NetworkJob)
 public:
diff --git a/Libraries/LibCore/Socket.h b/Libraries/LibCore/Socket.h
index 6523674b8c..a53d433568 100644
--- a/Libraries/LibCore/Socket.h
+++ b/Libraries/LibCore/Socket.h
@@ -32,8 +32,6 @@
 
 namespace Core {
 
-class Notifier;
-
 class Socket : public IODevice {
     C_OBJECT(Socket)
 public:
diff --git a/Libraries/LibCore/TCPServer.h b/Libraries/LibCore/TCPServer.h
index d62c8f6ce8..b516ec1500 100644
--- a/Libraries/LibCore/TCPServer.h
+++ b/Libraries/LibCore/TCPServer.h
@@ -32,8 +32,6 @@
 
 namespace Core {
 
-class TCPSocket;
-
 class TCPServer : public Object {
     C_OBJECT(TCPServer)
 public:
diff --git a/Libraries/LibCore/TCPSocket.h b/Libraries/LibCore/TCPSocket.h
index 156fbe2b36..8bdd1ae70c 100644
--- a/Libraries/LibCore/TCPSocket.h
+++ b/Libraries/LibCore/TCPSocket.h
@@ -31,8 +31,6 @@
 
 namespace Core {
 
-class TCPServer;
-
 class TCPSocket final : public Socket {
     C_OBJECT(TCPSocket)
 public: