diff --git a/src/playsim/actionspecials.h b/src/playsim/actionspecials.h
index fcd4d386b..78f2e87eb 100644
--- a/src/playsim/actionspecials.h
+++ b/src/playsim/actionspecials.h
@@ -271,6 +271,7 @@ DEFINE_SPECIAL(Floor_MoveToValueAndCrush, 279, 4, 5, 5)
 DEFINE_SPECIAL(Ceiling_MoveToValueAndCrush, 280, 4, 5, 5)
 DEFINE_SPECIAL(Line_SetAutomapFlags, 281, 3, 3, 3)
 DEFINE_SPECIAL(Line_SetAutomapStyle, 282, 2, 2, 2)
+DEFINE_SPECIAL(Polyobj_StopSound, 283, 1, 1, 1)
 
 DEFINE_SPECIAL(Line_QuickPortal, 301, -1, -1, 1)
 
diff --git a/src/playsim/p_lnspec.cpp b/src/playsim/p_lnspec.cpp
index 690636c38..2dd6d9493 100644
--- a/src/playsim/p_lnspec.cpp
+++ b/src/playsim/p_lnspec.cpp
@@ -57,6 +57,7 @@
 #include "g_levellocals.h"
 #include "vm.h"
 #include "p_destructible.h"
+#include "s_sndseq.h"
 
 // Remaps EE sector change types to Generic_Floor values. According to the Eternity Wiki:
 /*
@@ -234,6 +235,20 @@ FUNC(LS_Polyobj_Stop)
 	return EV_StopPoly (Level, arg0);
 }
 
+FUNC(LS_Polyobj_StopSound)
+// Polyobj_StopSound (po)
+{
+	FPolyObj *poly;
+
+	poly = Level->GetPolyobj(arg0);
+	if (poly != nullptr)
+	{
+		SN_StopSequence(poly);
+	}
+
+	return true;
+}
+
 FUNC(LS_Door_Close)
 // Door_Close (tag, speed, lighttag)
 {
@@ -3813,8 +3828,7 @@ static lnSpecFunc LineSpecials[] =
 	/* 280 */ LS_Ceiling_MoveToValueAndCrush,
 	/* 281 */ LS_Line_SetAutomapFlags,
 	/* 282 */ LS_Line_SetAutomapStyle,
-
-
+	/* 283 */ LS_Polyobj_StopSound,
 };
 
 #define DEFINE_SPECIAL(name, num, min, max, mmax) {#name, num, min, max, mmax},
@@ -3965,4 +3979,3 @@ DEFINE_ACTION_FUNCTION(FLevelLocals, ExecuteSpecial)
 
 	ACTION_RETURN_INT(P_ExecuteSpecial(self, special, linedef, activator, lineside, arg1, arg2, arg3, arg4, arg5));
 }
-