diff --git a/SPIRV/GlslangToSpv.cpp b/SPIRV/GlslangToSpv.cpp
index 5c439fa..5e3dc52 100755
--- a/SPIRV/GlslangToSpv.cpp
+++ b/SPIRV/GlslangToSpv.cpp
@@ -1115,6 +1115,9 @@
             builder.accessChainPushSwizzle(swizzle, convertGlslangToSpvType(node->getLeft()->getType()));
         }
         return false;
+    case glslang::EOpMatrixSwizzle:
+        logger->missingFunctionality("matrix swizzle");
+        return true;
     case glslang::EOpLogicalOr:
     case glslang::EOpLogicalAnd:
         {