diff --git a/projects/openttd_vs80.vcproj b/projects/openttd_vs80.vcproj
--- a/projects/openttd_vs80.vcproj
+++ b/projects/openttd_vs80.vcproj
@@ -2340,10 +2340,6 @@
 			Name="Script"
 			>
 			<File
-				RelativePath=".\..\src\script\fake_squirrel_types.hpp"
-				>
-			</File>
-			<File
 				RelativePath=".\..\src\script\script_info.cpp"
 				>
 			</File>
diff --git a/projects/openttd_vs90.vcproj b/projects/openttd_vs90.vcproj
--- a/projects/openttd_vs90.vcproj
+++ b/projects/openttd_vs90.vcproj
@@ -2337,10 +2337,6 @@
 			Name="Script"
 			>
 			<File
-				RelativePath=".\..\src\script\fake_squirrel_types.hpp"
-				>
-			</File>
-			<File
 				RelativePath=".\..\src\script\script_info.cpp"
 				>
 			</File>
diff --git a/source.list b/source.list
--- a/source.list
+++ b/source.list
@@ -518,7 +518,6 @@ 3rdparty/minilzo/minilzo.c
 3rdparty/minilzo/minilzo.h
 
 # Script
-script/fake_squirrel_types.hpp
 script/script_info.cpp
 script/script_info.hpp
 script/script_scanner.cpp
diff --git a/src/ai/api/ai_types.hpp b/src/ai/api/ai_types.hpp
--- a/src/ai/api/ai_types.hpp
+++ b/src/ai/api/ai_types.hpp
@@ -79,7 +79,7 @@
 
 #include "../../core/overflowsafe_type.hpp"
 #include "../../company_type.h"
-#include "../../script/fake_squirrel_types.hpp"
+#include <squirrel.h>
 
 /* Define all types here, so we don't have to include the whole _type.h maze */
 typedef uint BridgeType;     //!< Internal name, not of any use for you.
diff --git a/src/script/fake_squirrel_types.hpp b/src/script/fake_squirrel_types.hpp
deleted file mode 100644
--- a/src/script/fake_squirrel_types.hpp
+++ /dev/null
@@ -1,23 +0,0 @@
-/* $Id$ */
-
-/*
- * This file is part of OpenTTD.
- * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
- * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
- * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
- */
-
-/** @file fake_squirrel_types.hpp Provides definitions for some squirrel types to prevent including squirrel.h in header files.*/
-
-#ifndef FAKE_SQUIRREL_TYPES_HPP
-#define FAKE_SQUIRREL_TYPES_HPP
-
-#ifndef _SQUIRREL_H_
-/* Life becomes easier when we can tell about a function it needs the VM, but
- *  without really including 'squirrel.h'. */
-typedef struct SQVM *HSQUIRRELVM;  //!< Pointer to Squirrel Virtual Machine.
-typedef int SQInteger;             //!< Squirrel Integer.
-typedef struct SQObject HSQOBJECT; //!< Squirrel Object (fake declare)
-#endif
-
-#endif /* FAKE_SQUIRREL_TYPES_HPP */