diff --git a/rpcs3/Emu/RSX/gcm_enums.cpp b/rpcs3/Emu/RSX/gcm_enums.cpp
index 8cd1aa8f5b..2ba454b82c 100644
--- a/rpcs3/Emu/RSX/gcm_enums.cpp
+++ b/rpcs3/Emu/RSX/gcm_enums.cpp
@@ -5,6 +5,7 @@ rsx::vertex_base_type rsx::to_vertex_base_type(u8 in)
 {
 	switch (in)
 	{
+	case 0: return rsx::vertex_base_type::invalid;
 	case 1: return rsx::vertex_base_type::s1;
 	case 2: return rsx::vertex_base_type::f;
 	case 3: return rsx::vertex_base_type::sf;
diff --git a/rpcs3/Emu/RSX/gcm_enums.h b/rpcs3/Emu/RSX/gcm_enums.h
index b3a4ea7d39..88c966ead5 100644
--- a/rpcs3/Emu/RSX/gcm_enums.h
+++ b/rpcs3/Emu/RSX/gcm_enums.h
@@ -5,6 +5,7 @@ namespace rsx
 {
 	enum class vertex_base_type : u8
 	{
+		invalid,
 		s1, ///< signed byte
 		f, ///< float
 		sf, ///< half float