diff --git a/llvm/test/tools/llvm-ar/default-xcoff.test b/llvm/test/tools/llvm-ar/default-xcoff.test
index 25c0a4a7db29..bfffc3e3bb1e 100644
--- a/llvm/test/tools/llvm-ar/default-xcoff.test
+++ b/llvm/test/tools/llvm-ar/default-xcoff.test
@@ -7,4 +7,4 @@
 ; RUN: echo "test big archive" > %t.txt
 ; RUN: not llvm-ar cr %t.ar %t.txt 2>&1 | FileCheck %s
 
-; CHECK: unsupported big AIX write operation
+; CHECK: big archive writer operation on AIX not yet supported
diff --git a/llvm/tools/llvm-ar/llvm-ar.cpp b/llvm/tools/llvm-ar/llvm-ar.cpp
index 3d4964f96d72..0d87e25edb42 100644
--- a/llvm/tools/llvm-ar/llvm-ar.cpp
+++ b/llvm/tools/llvm-ar/llvm-ar.cpp
@@ -945,7 +945,7 @@ static void performWriteOperation(ArchiveOperation Operation,
       Kind = !NewMembers.empty() ? getKindFromMember(NewMembers.front())
                                  : getDefaultForHost();
     if (Kind == object::Archive::K_AIXBIG)
-      fail("unsupported big AIX write operation");
+      fail("big archive writer operation on AIX not yet supported");
     break;
   case GNU:
     Kind = object::Archive::K_GNU;