diff --git a/include/modules/serversecure.lua b/include/modules/serversecure.lua
index a72fb11..bd06b59 100644
--- a/include/modules/serversecure.lua
+++ b/include/modules/serversecure.lua
@@ -2,8 +2,8 @@ require("serversecure.core")
 
 local format, match, band, rshift = string.format, string.match, bit.band, bit.rshift
 
-serversecure.Version = "serversecure 1.5.19"
-serversecure.VersionNum = 10519
+serversecure.Version = "serversecure 1.5.20"
+serversecure.VersionNum = 10520
 
 function serversecure.IPToString(uint)
 	if not uint then
diff --git a/source/filecheck.cpp b/source/filecheck.cpp
index 45ada1a..bafee67 100644
--- a/source/filecheck.cpp
+++ b/source/filecheck.cpp
@@ -1,7 +1,7 @@
 #include <filecheck.hpp>
 #include <main.hpp>
 #include <GarrysMod/Lua/Interface.h>
-#include <GarrysMod/LuaHelpers.hpp>
+#include <GarrysMod/Lua/Helpers.hpp>
 #include <stdint.h>
 #include <stddef.h>
 #include <string>
@@ -26,22 +26,16 @@ namespace filecheck
 #if defined SYSTEM_WINDOWS
 
 	static const char CNetChan__IsValidFileForTransfer_sig[] =
-		"\x55\x8B\xEC\x53\x8B\x5D\x08\x85\xDB\x0F\x84\x2A\x2A\x2A\x2A\x8A\x03";
+		"\x55\x8B\xEC\x53\x8B\x5D\x08\x56\x57\x85\xDB\x0F\x84";
 	static const size_t CNetChan__IsValidFileForTransfer_siglen =
 		sizeof( CNetChan__IsValidFileForTransfer_sig ) - 1;
 
-#elif defined SYSTEM_LINUX
+#elif defined SYSTEM_LINUX || defined SYSTEM_MACOSX
 
 	static const char CNetChan__IsValidFileForTransfer_sig[] =
 		"@_ZN8CNetChan22IsValidFileForTransferEPKc";
 	static const size_t CNetChan__IsValidFileForTransfer_siglen = 0;
 
-#elif defined SYSTEM_MACOSX
-
-	static const char CNetChan__IsValidFileForTransfer_sig[] =
-		"@__ZN8CNetChan22IsValidFileForTransferEPKc";
-	static const size_t CNetChan__IsValidFileForTransfer_siglen = 0;
-
 #endif
 
 	static CNetChan__IsValidFileForTransfer_t CNetChan__IsValidFileForTransfer_original = nullptr;
diff --git a/source/main.cpp b/source/main.cpp
index 5eb14a2..5841d17 100644
--- a/source/main.cpp
+++ b/source/main.cpp
@@ -15,16 +15,11 @@ namespace global
 		"\x2A\x2A\x2A\x2A\xE8\x2A\x2A\x2A\x2A\xD8\x6D\x24\x83\x4D\xEC\x10";
 	static const size_t IServer_siglen = sizeof( IServer_sig ) - 1;
 
-#elif defined SYSTEM_LINUX
+#elif defined SYSTEM_LINUX || defined SYSTEM_MACOSX
 
 	static const char IServer_sig[] = "@sv";
 	static const size_t IServer_siglen = 0;
 
-#elif defined SYSTEM_MACOSX
-
-	static const char IServer_sig[] = "@_sv";
-	static const size_t IServer_siglen = 0;
-
 #endif
 
 	SourceSDK::FactoryLoader engine_loader( "engine", false, true, "bin/" );
diff --git a/source/netfilter/core.cpp b/source/netfilter/core.cpp
index 74e0263..3cec2ec 100644
--- a/source/netfilter/core.cpp
+++ b/source/netfilter/core.cpp
@@ -181,7 +181,7 @@ namespace netfilter
 
 	static const char operating_system_char = 'w';
 
-#elif defined SYSTEM_LINUX
+#elif defined SYSTEM_LINUX || defined SYSTEM_MACOSX
 
 	static const char SteamGameServerAPIContext_sym[] = "@_ZL27s_SteamGameServerAPIContext";
 	static const size_t SteamGameServerAPIContext_symlen = 0;
@@ -195,27 +195,11 @@ namespace netfilter
 	static const char net_sockets_sig[] = "@_ZL11net_sockets";
 	static const size_t net_sockets_siglen = 0;
 
+#ifdef SYSTEM_LINUX
 	static const char operating_system_char = 'l';
-
-	typedef int SOCKET;
-
-	static const SOCKET INVALID_SOCKET = -1;
-
-#elif defined SYSTEM_MACOSX
-
-	static const char SteamGameServerAPIContext_sym[] = "@__ZL27s_SteamGameServerAPIContext";
-	static const size_t SteamGameServerAPIContext_symlen = 0;
-
-	static const char FileSystemFactory_sym[] = "@__Z17FileSystemFactoryPKcPi";
-	static const size_t FileSystemFactory_symlen = 0;
-
-	static const char g_pFullFileSystem_sym[] = "@_g_pFullFileSystem";
-	static const size_t g_pFullFileSystem_symlen = 0;
-
-	static const char net_sockets_sig[] = "@__ZL11net_sockets";
-	static const size_t net_sockets_siglen = 0;
-
+#else
 	static const char operating_system_char = 'm';
+#endif
 
 	typedef int SOCKET;