diff --git a/SPIRV/GlslangToSpv.cpp b/SPIRV/GlslangToSpv.cpp
index fabaee9..4019436 100644
--- a/SPIRV/GlslangToSpv.cpp
+++ b/SPIRV/GlslangToSpv.cpp
@@ -7619,8 +7619,9 @@
     case glslang::EOpIsHelperInvocation:
     {
         std::vector<spv::Id> args; // Dummy arguments
-        spv::Id id = builder.createOp(spv::OpIsHelperInvocationEXT, typeId, args);
-        return id;
+        builder.addExtension(spv::E_SPV_EXT_demote_to_helper_invocation);
+        builder.addCapability(spv::CapabilityDemoteToHelperInvocationEXT);
+        return builder.createOp(spv::OpIsHelperInvocationEXT, typeId, args);
     }
 
     case glslang::EOpReadClockSubgroupKHR: {