diff --git a/desmume/src/gfx3d.h b/desmume/src/gfx3d.h
index ed3f5e943..1eea3b14c 100644
--- a/desmume/src/gfx3d.h
+++ b/desmume/src/gfx3d.h
@@ -521,12 +521,13 @@ struct POLYLIST {
 };
 
 struct VERT {
+	// Align to 16 for SSE instructions to work
 	union {
 		float coord[4];
 		struct {
 			float x,y,z,w;
 		};
-	};
+	} DS_ALIGN(16);
 	union {
 		float texcoord[2];
 		struct {