diff --git a/core/clingutils/src/TClingUtils.cxx b/core/clingutils/src/TClingUtils.cxx
index 2373f0cd429df6..f574adc2e9c03e 100644
--- a/core/clingutils/src/TClingUtils.cxx
+++ b/core/clingutils/src/TClingUtils.cxx
@@ -4765,6 +4765,7 @@ clang::QualType ROOT::TMetaUtils::ReSubstTemplateArg(clang::QualType input, cons
             // (See AddDefaultParameters).
             return input;
          } else {
+           if (TST->getArg(index).getKind() == clang::TemplateArgument::Type)
             return TST->getArg(index).getAsType();
          }
       }