diff --git a/src/mame/video/n64.h b/src/mame/video/n64.h
index 9e9e96843e4..320ab26c536 100644
--- a/src/mame/video/n64.h
+++ b/src/mame/video/n64.h
@@ -428,6 +428,7 @@ class n64_rdp : public poly_manager<UINT32, rdp_poly_state, 8, 32000>
 			}
 
 			memset(m_tiles, 0, 8 * sizeof(N64Tile));
+			memset(m_cmd_data, 0, sizeof(m_cmd_data));
 		}
 
 		void        ProcessList();