diff --git a/include/hpml/mat4.h b/include/hpml/mat4.h
index a9a2eda..e1ff615 100644
--- a/include/hpml/mat4.h
+++ b/include/hpml/mat4.h
@@ -38,7 +38,7 @@ typedef struct mat4_t
 {
 	union
 	{
-		struct
+		union
 		{
 			// elements
 			struct