diff --git a/engines/cge2/cge2.h b/engines/cge2/cge2.h
index 380e7da04c5..336d7277870 100644
--- a/engines/cge2/cge2.h
+++ b/engines/cge2/cge2.h
@@ -232,8 +232,8 @@ public:
 	void snGoto(Sprite *spr, int val);
 	void snMove(Sprite *spr, V3D pos);
 	void snSlave(Sprite *spr, int val);
-	void snTrans(Sprite *spr, int val);
-	void snPort(Sprite *spr, int val);
+	void snTrans(Sprite *spr, int trans);
+	void snPort(Sprite *spr, int port);
 	void snMouse(bool on);
 	void snNNext(Sprite *spr, Action act, int val);
 	void snRNNext(Sprite *spr, int val);
diff --git a/engines/cge2/snail.cpp b/engines/cge2/snail.cpp
index aebe1f0778e..4ba83488176 100644
--- a/engines/cge2/snail.cpp
+++ b/engines/cge2/snail.cpp
@@ -579,12 +579,16 @@ void CGE2Engine::snSlave(Sprite *spr, int val) {
 	warning("STUB: CGE2Engine::snSlave()");
 }
 
-void CGE2Engine::snTrans(Sprite *spr, int val) {
-	warning("STUB: CGE2Engine::snTrans()");
+void CGE2Engine::snTrans(Sprite *spr, int trans) {
+	if (spr) {
+		spr->_flags._tran = (trans < 0) ? !spr->_flags._tran : (trans != 0);
+	}
 }
 
-void CGE2Engine::snPort(Sprite *spr, int val) {
-	warning("STUB: CGE2Engine::snPort()");
+void CGE2Engine::snPort(Sprite *spr, int port) {
+	if (spr) {
+		spr->_flags._port = (port < 0) ? !spr->_flags._port : (port != 0);
+	}
 }
 
 void CGE2Engine::snMouse(bool on) {