diff --git a/src/renderer_mtl.mm b/src/renderer_mtl.mm
index 71a84741..60864141 100644
--- a/src/renderer_mtl.mm
+++ b/src/renderer_mtl.mm
@@ -1453,6 +1453,8 @@ namespace bgfx { namespace mtl
 
 		m_processedUniforms = false;
 		m_numPredefined = 0;
+
+		m_renderPipelineStateCache.invalidate();
 	}
 
 	UniformType::Enum convertMtlType(MTLDataType _type)