diff --git a/include/engine/extdll.h b/include/engine/extdll.h
index b0c944d..1d83402 100644
--- a/include/engine/extdll.h
+++ b/include/engine/extdll.h
@@ -32,7 +32,8 @@
 #include "windows.h"
 #include "winsock2.h"
 #else   // _WIN32
-
+#define FALSE 0
+#define TRUE (!FALSE)
 #define MAX_PATH PATH_MAX
 #include <limits.h>
 #include <stdarg.h>
diff --git a/source/manager.cpp b/source/manager.cpp
index 1fc540b..52ae81c 100644
--- a/source/manager.cpp
+++ b/source/manager.cpp
@@ -87,7 +87,7 @@ void BotManager::TouchWithKillerEntity (Bot *bot)
    kv.szClassName = const_cast <char *> (g_weaponDefs[bot->m_currentWeapon].className);
    kv.szKeyName = "damagetype";
    kv.szValue = const_cast <char *> (FormatBuffer ("%d", (1 << 4)));
-   kv.fHandled = 0;
+   kv.fHandled = FALSE;
 
    MDLL_KeyValue (m_killerEntity, &kv);
    MDLL_Touch (m_killerEntity, bot->GetEntity ());