diff --git a/indra/llrender/llvertexbuffer.cpp b/indra/llrender/llvertexbuffer.cpp
index 572ae1390994c50706a493acb648a2ef5998e093..ecfe845b3427dfafbdd8eccbb82d3c074c7c6a5b 100644
--- a/indra/llrender/llvertexbuffer.cpp
+++ b/indra/llrender/llvertexbuffer.cpp
@@ -237,7 +237,7 @@ void LLVertexBuffer::drawRange(U32 mode, U32 start, U32 end, U32 count, U32 indi
 		llerrs << "Wrong vertex buffer bound." << llendl;
 	}
 
-	if (mode > LLRender::NUM_MODES)
+	if (mode >= LLRender::NUM_MODES)
 	{
 		llerrs << "Invalid draw mode: " << mode << llendl;
 		return;
@@ -267,7 +267,7 @@ void LLVertexBuffer::draw(U32 mode, U32 count, U32 indices_offset) const
 		llerrs << "Wrong vertex buffer bound." << llendl;
 	}
 
-	if (mode > LLRender::NUM_MODES)
+	if (mode >= LLRender::NUM_MODES)
 	{
 		llerrs << "Invalid draw mode: " << mode << llendl;
 		return;
@@ -292,7 +292,7 @@ void LLVertexBuffer::drawArrays(U32 mode, U32 first, U32 count) const
 		llerrs << "Wrong vertex buffer bound." << llendl;
 	}
 
-	if (mode > LLRender::NUM_MODES)
+	if (mode >= LLRender::NUM_MODES)
 	{
 		llerrs << "Invalid draw mode: " << mode << llendl;
 		return;