diff --git a/GPU/GLES/Spline.cpp b/GPU/GLES/Spline.cpp
index 8ecd6c63a1..0e054173ff 100644
--- a/GPU/GLES/Spline.cpp
+++ b/GPU/GLES/Spline.cpp
@@ -124,7 +124,7 @@ u32 TransformDrawEngine::NormalizeVertices(u8 *outPtr, u8 *bufPtr, const u8 *inP
 	}
 
 	// Okay, there we are! Return the new type (but keep the index bits)
-	return GE_VTYPE_TC_FLOAT | GE_VTYPE_COL_8888 | GE_VTYPE_NRM_FLOAT | GE_VTYPE_POS_FLOAT | (vertType & GE_VTYPE_IDX_MASK);
+	return GE_VTYPE_TC_FLOAT | GE_VTYPE_COL_8888 | GE_VTYPE_NRM_FLOAT | GE_VTYPE_POS_FLOAT | (vertType & (GE_VTYPE_IDX_MASK | GE_VTYPE_THROUGH));
 }
 
 u32 TransformDrawEngine::NormalizeVertices(u8 *outPtr, u8 *bufPtr, const u8 *inPtr, int lowerBound, int upperBound, u32 vertType) {