diff --git a/src/playsim/p_acs.cpp b/src/playsim/p_acs.cpp
index 9a547aaa1..eec8e752e 100644
--- a/src/playsim/p_acs.cpp
+++ b/src/playsim/p_acs.cpp
@@ -6690,7 +6690,7 @@ doplaysound:			if (funcIndex == ACSF_PlayActorSound)
 			int lineno = it.Next();
 			if (lineno < 0) return 0;
 			DVector2 delta = Level->lines[lineno].Delta();
-			double result = delta[funcIndex - ACSF_GetLineX] * ACSToDouble(args[1]);
+			double result = Level->lines[lineno].v1->fPos()[funcIndex - ACSF_GetLineX] + delta[funcIndex - ACSF_GetLineX] * ACSToDouble(args[1]);
 			if (args[2])
 			{
 				DVector2 normal = DVector2(delta.Y, -delta.X).Unit();