diff --git a/src/actor.h b/src/actor.h
index 25caaaedec..8f38e6e8cb 100644
--- a/src/actor.h
+++ b/src/actor.h
@@ -893,7 +893,7 @@ public:
 			fixedvec2 ret = { X() + dx, Y() + dy };
 			return ret;
 		}
-		else return P_GetOffsetPosition(this, dx, dy);
+		else return P_GetOffsetPosition(X(), Y(), dx, dy);
 	}
 
 
@@ -905,7 +905,7 @@ public:
 							  Y() + FixedMul(length, finesine[angle >> ANGLETOFINESHIFT]) };
 			return ret;
 		}
-		else return P_GetOffsetPosition(this, FixedMul(length, finecosine[angle >> ANGLETOFINESHIFT]), FixedMul(length, finesine[angle >> ANGLETOFINESHIFT]));
+		else return P_GetOffsetPosition(X(), Y(), FixedMul(length, finecosine[angle >> ANGLETOFINESHIFT]), FixedMul(length, finesine[angle >> ANGLETOFINESHIFT]));
 	}
 
 	fixedvec3 Vec3Offset(fixed_t dx, fixed_t dy, fixed_t dz, bool absolute = false)
@@ -917,7 +917,7 @@ public:
 		}
 		else
 		{
-			fixedvec2 op = P_GetOffsetPosition(this, dx, dy);
+			fixedvec2 op = P_GetOffsetPosition(X(), Y(), dx, dy);
 			fixedvec3 pos = { op.x, op.y, Z() + dz };
 			return pos;
 		}
@@ -933,7 +933,7 @@ public:
 		}
 		else
 		{
-			fixedvec2 op = P_GetOffsetPosition(this, FixedMul(length, finecosine[angle >> ANGLETOFINESHIFT]), FixedMul(length, finesine[angle >> ANGLETOFINESHIFT]));
+			fixedvec2 op = P_GetOffsetPosition(X(), Y(), FixedMul(length, finecosine[angle >> ANGLETOFINESHIFT]), FixedMul(length, finesine[angle >> ANGLETOFINESHIFT]));
 			fixedvec3 pos = { op.x, op.y, Z() + dz };
 			return pos;
 		}
diff --git a/src/portal.cpp b/src/portal.cpp
index 92d7534074..8cf4bf546d 100644
--- a/src/portal.cpp
+++ b/src/portal.cpp
@@ -701,12 +701,12 @@ void P_NormalizeVXVY(fixed_t& vx, fixed_t& vy)
 //
 //============================================================================
 
-fixedvec2 P_GetOffsetPosition(AActor *actor, fixed_t dx, fixed_t dy)
+fixedvec2 P_GetOffsetPosition(fixed_t x, fixed_t y, fixed_t dx, fixed_t dy)
 {
-	fixedvec2 dest = { actor->X() + dx, actor->Y() + dy };
+	fixedvec2 dest = { x + dx, y + dy };
 	if (PortalBlockmap.containsLines)
 	{
-		fixed_t actx = actor->X(), acty = actor->Y();
+		fixed_t actx = x, acty = y;
 		// Try some easily discoverable early-out first. If we know that the trace cannot possibly find a portal, this saves us from calling the traverser completely for vast parts of the map.
 		if (dx < 128 * FRACUNIT && dy < 128 * FRACUNIT)
 		{
diff --git a/src/portal.h b/src/portal.h
index ef8cec98af..127a9ec3ba 100644
--- a/src/portal.h
+++ b/src/portal.h
@@ -198,6 +198,6 @@ void P_TranslatePortalAngle(line_t* src, line_t* dst, angle_t& angle);
 void P_TranslatePortalZ(line_t* src, line_t* dst, fixed_t& z);
 void P_NormalizeVXVY(fixed_t& vx, fixed_t& vy);
 fixed_t P_PointLineDistance(line_t* line, fixed_t x, fixed_t y);
-fixedvec2 P_GetOffsetPosition(AActor *actor, fixed_t dx, fixed_t dy);
+fixedvec2 P_GetOffsetPosition(fixed_t x, fixed_t y, fixed_t dx, fixed_t dy);
 
 #endif
\ No newline at end of file