diff --git a/GPU/Common/SoftwareTransformCommon.cpp b/GPU/Common/SoftwareTransformCommon.cpp
index 9c2c989c0493..98b5adc0799c 100644
--- a/GPU/Common/SoftwareTransformCommon.cpp
+++ b/GPU/Common/SoftwareTransformCommon.cpp
@@ -786,33 +786,17 @@ void SoftwareTransform::ExpandLines(int vertexCount, int &maxIndex, u16 *&inds,
 			float vertical = transVtx2.y - transVtx1.y;
 			Vec2f addWidth = Vec2f(-vertical, horizontal).Normalized();
 
-			// bottom right
-			trans[0] = transVtx2;
-			trans[0].x += addWidth.x * dx;
-			trans[0].y += addWidth.y * dy;
-			trans[0].u += addWidth.x * du;
-			trans[0].v += addWidth.y * dv;
+			float xoff = addWidth.x * dx;
+			float yoff = addWidth.y * dy;
 
+			// bottom right
+			trans[0].CopyFromWithOffset(transVtx2, xoff, yoff);
 			// top right
-			trans[1] = transVtx1;
-			trans[1].x += addWidth.x * dx;
-			trans[1].y += addWidth.y * dy;
-			trans[1].u += addWidth.x * du;
-			trans[1].v += addWidth.y * dv;
-
+			trans[1].CopyFromWithOffset(transVtx1, xoff, yoff);
 			// top left
-			trans[2] = transVtx1;
-			trans[2].x -= addWidth.x * dx;
-			trans[2].y -= addWidth.y * dy;
-			trans[2].u -= addWidth.x * du;
-			trans[2].v -= addWidth.y * dv;
-
+			trans[2].CopyFromWithOffset(transVtx1, -xoff, -yoff);
 			// bottom left
-			trans[3] = transVtx2;
-			trans[3].x -= addWidth.x * dx;
-			trans[3].y -= addWidth.y * dy;
-			trans[3].u -= addWidth.x * du;
-			trans[3].v -= addWidth.y * dv;
+			trans[3].CopyFromWithOffset(transVtx2, -xoff, -yoff);
 
 			// Triangle: BR-TR-TL
 			indsOut[0] = i * 2 + 0;
diff --git a/GPU/GPUCommon.h b/GPU/GPUCommon.h
index 880aceab2573..623842853c88 100644
--- a/GPU/GPUCommon.h
+++ b/GPU/GPUCommon.h
@@ -57,6 +57,13 @@ struct TransformedVertex {
 		u8 color1[4];   // prelit
 		u32 color1_32;
 	};
+
+
+	void CopyFromWithOffset(const TransformedVertex &other, float xoff, float yoff) {
+		this->x = other.x + xoff;
+		this->y = other.y + yoff;
+		memcpy(&this->z, &other.z, sizeof(*this) - sizeof(float) * 2);
+	}
 };
 
 class GPUCommon : public GPUInterface, public GPUDebugInterface {