diff --git a/src/p_acs.cpp b/src/p_acs.cpp
index 003138211..032abbc27 100644
--- a/src/p_acs.cpp
+++ b/src/p_acs.cpp
@@ -5567,6 +5567,11 @@ doplaysound:			if (funcIndex == ACSF_PlayActorSound)
 			if (argCount >= 2)
 			{
 				const char *a, *b;
+				// If the string indicies are the same, then they are the same string.
+				if (args[0] == args[1])
+				{
+					return 0;
+				}
 				a = FBehavior::StaticLookupString(args[0]);
 				b = FBehavior::StaticLookupString(args[1]);
 
diff --git a/src/p_lnspec.cpp b/src/p_lnspec.cpp
index 1ffeb813f..103ac1264 100644
--- a/src/p_lnspec.cpp
+++ b/src/p_lnspec.cpp
@@ -1132,7 +1132,7 @@ FUNC(LS_Teleport_Line)
 
 static void ThrustThingHelper(AActor *it, DAngle angle, double force, INTBOOL nolimit)
 {
-	it->VelFromAngle(angle, force);
+	it->Thrust(angle, force);
 	if (!nolimit)
 	{
 		it->Vel.X = clamp(it->Vel.X, -MAXMOVE, MAXMOVE);