diff --git a/core/NextMap.cpp b/core/NextMap.cpp
index b2fffe48..0ce236c8 100644
--- a/core/NextMap.cpp
+++ b/core/NextMap.cpp
@@ -222,4 +222,4 @@ void CmdChangeLevelCallback()
 		UTIL_Format(g_NextMap.m_tempChangeInfo.m_mapName, sizeof(g_NextMap.m_tempChangeInfo.m_mapName), command.Arg(1));
 		UTIL_Format(g_NextMap.m_tempChangeInfo.m_changeReason, sizeof(g_NextMap.m_tempChangeInfo.m_changeReason), "changelevel Command");
 	}
-}
\ No newline at end of file
+}
diff --git a/core/NextMap.h b/core/NextMap.h
index 8f6377ce..c1dd9c5a 100644
--- a/core/NextMap.h
+++ b/core/NextMap.h
@@ -58,6 +58,12 @@ struct MapChangeData
 	time_t startTime;
 };
 
+#if defined ORANGEBOX_BUILD
+void CmdChangeLevelCallback(const CCommand &command);
+#else
+void CmdChangeLevelCallback();
+#endif
+
 class NextMapManager : public SMGlobalClass
 {
 public: