diff --git a/GPU/Common/VertexDecoderCommon.cpp b/GPU/Common/VertexDecoderCommon.cpp
index 4cf4d37287..8d37e72a54 100644
--- a/GPU/Common/VertexDecoderCommon.cpp
+++ b/GPU/Common/VertexDecoderCommon.cpp
@@ -502,28 +502,28 @@ void VertexDecoder::Step_Color5551() const
 {
 	u8 *c = decoded_ + decFmt.c0off;
 	u16 cdata = *(u16_le *)(ptr_ + coloff);
+	gstate_c.vertexFullAlpha = gstate_c.vertexFullAlpha && (cdata >> 15) != 0;
 	c[0] = Convert5To8(cdata & 0x1f);
 	c[1] = Convert5To8((cdata >> 5) & 0x1f);
 	c[2] = Convert5To8((cdata >> 10) & 0x1f);
 	c[3] = (cdata >> 15) ? 255 : 0;
-	gstate_c.vertexFullAlpha = gstate_c.vertexFullAlpha && c[3] != 0;
 }
 
 void VertexDecoder::Step_Color4444() const
 {
 	u8 *c = decoded_ + decFmt.c0off;
 	u16 cdata = *(u16_le *)(ptr_ + coloff);
+	gstate_c.vertexFullAlpha = gstate_c.vertexFullAlpha && (cdata >> 12) == 0xF;
 	for (int j = 0; j < 4; j++)
 		c[j] = Convert4To8((cdata >> (j * 4)) & 0xF);
-	gstate_c.vertexFullAlpha = gstate_c.vertexFullAlpha && c[3] == 255;
 }
 
 void VertexDecoder::Step_Color8888() const
 {
 	u8 *c = decoded_ + decFmt.c0off;
 	const u8 *cdata = (const u8*)(ptr_ + coloff);
+	gstate_c.vertexFullAlpha = gstate_c.vertexFullAlpha && cdata[3] == 255;
 	memcpy(c, cdata, sizeof(u8) * 4);
-	gstate_c.vertexFullAlpha = gstate_c.vertexFullAlpha && c[3] == 255;
 }
 
 void VertexDecoder::Step_Color565Morph() const