diff --git a/flang/include/flang/Runtime/descriptor.h b/flang/include/flang/Runtime/descriptor.h
index 96d56d9b43a62b..1b0b7e23ce6ccd 100644
--- a/flang/include/flang/Runtime/descriptor.h
+++ b/flang/include/flang/Runtime/descriptor.h
@@ -456,6 +456,7 @@ class alignas(Descriptor) StaticDescriptor {
     assert(descriptor().rank() <= maxRank);
     assert(descriptor().SizeInBytes() <= byteSize);
     if (DescriptorAddendum * addendum{descriptor().Addendum()}) {
+      (void)addendum;
       assert(hasAddendum);
       assert(addendum->LenParameters() <= maxLengthTypeParameters);
     } else {