diff --git a/vphysics_jolt/cbase.h b/vphysics_jolt/cbase.h
index 5e5ef88..4aeeb1f 100644
--- a/vphysics_jolt/cbase.h
+++ b/vphysics_jolt/cbase.h
@@ -13,8 +13,10 @@
 #include "tier0/logging.h"
 #endif
 
-#ifdef GAME_SDK2013
+#if defined( GAME_SDK2013 )
 #include "compat/compat_sdk2013.h"
+#elif defined( GAME_ASW )
+#include "compat/compat_asw.h"
 #endif
 
 #include "compat/branch_overrides.h"
diff --git a/vphysics_jolt/compat/compat_asw.h b/vphysics_jolt/compat/compat_asw.h
new file mode 100644
index 0000000..e619c18
--- /dev/null
+++ b/vphysics_jolt/compat/compat_asw.h
@@ -0,0 +1,49 @@
+
+#pragma once
+
+#include "memalloc.h"
+
+#define DevAssert( ... )
+#define DevAssertMsg( ... )
+#define AssertMsg_Internal( ... )
+
+template< typename A, typename B, typename C >
+[[nodiscard]] constexpr A clamp( const A val, const B minVal, const C maxVal )
+{
+	return MIN( MAX( val, minVal ), maxVal );
+}
+
+template< typename T >
+[[nodiscard]] constexpr T Min( const T valMin, const T valMax )
+{
+	return valMin < valMax ? valMin : valMax;
+}
+
+template< typename T >
+[[nodiscard]] constexpr T Max( const T valMin, const T valMax )
+{
+	return valMin > valMax ? valMin : valMax;
+}
+
+template< typename T >
+[[nodiscard]] constexpr T Clamp( const T val, const T minVal, const T maxVal )
+{
+	return Min( Max( val, minVal ), maxVal );
+}
+
+constexpr bool V_isdigit( char c )
+{
+	return c >= '0' && c <= '9';
+}
+
+inline void MemAlloc_Free( void *pMemBlock )
+{
+	g_pMemAlloc->Free( pMemBlock );
+}
+
+enum PlayerContactState_t
+{
+    PLAYER_CONTACT_PHYSICS = 1,
+    PLAYER_CONTACT_GAMEOBJECT = 2,
+};
+
diff --git a/vphysics_jolt/vphysics_jolt_inc.vpc b/vphysics_jolt/vphysics_jolt_inc.vpc
index 09e659c..ad06f66 100644
--- a/vphysics_jolt/vphysics_jolt_inc.vpc
+++ b/vphysics_jolt/vphysics_jolt_inc.vpc
@@ -20,6 +20,14 @@ $Configuration
 		$Create/UsePrecompiledHeader	"Use Precompiled Header (/Yu)"
 		$Create/UsePCHThroughFile		"cbase.h"
 	}
+
+	$Linker
+	{
+		// For Alien Swarm, we don't get the ability to build our own tier1 or mathlib
+		// which means we need to be compatible with the .libs provided built for
+		// ancient Visual Studio.
+		$AdditionalDependencies			"$BASE legacy_stdio_definitions.lib" [$GAME_ASW]
+	}
 }
 
 $Project "$PROJNAME"