diff --git a/src/bgfx_p.h b/src/bgfx_p.h
index 1ac2e153f..265fe30df 100644
--- a/src/bgfx_p.h
+++ b/src/bgfx_p.h
@@ -3500,6 +3500,8 @@ namespace bgfx
 				return handle;
 			}
 
+			_num  = bx::uint16_max(1, _num);
+
 			uint16_t idx = m_uniformHashMap.find(bx::hashMurmur2A(_name) );
 			if (UniformHashMap::invalid != idx)
 			{