diff --git a/rpcs3/Emu/RSX/Common/BufferUtils.cpp b/rpcs3/Emu/RSX/Common/BufferUtils.cpp
index 2ea98df02e..488560f251 100644
--- a/rpcs3/Emu/RSX/Common/BufferUtils.cpp
+++ b/rpcs3/Emu/RSX/Common/BufferUtils.cpp
@@ -936,7 +936,7 @@ namespace
 				if (is_primitive_restart_enabled && index == primitive_restart_index)
 					continue;
 
-				anchor = index;
+				anchor = min_max(min_index, max_index, index);
 				needs_anchor = false;
 				continue;
 			}
@@ -951,7 +951,7 @@ namespace
 			if (last_index == invalid_index)
 			{
 				//Need at least one anchor and one outer index to create a triangle
-				last_index = index;
+				last_index = min_max(min_index, max_index, index);
 				continue;
 			}