diff --git a/clang/include/clang/Basic/DiagnosticSemaKinds.td b/clang/include/clang/Basic/DiagnosticSemaKinds.td
index b78c3994da78..8b76464db34d 100644
--- a/clang/include/clang/Basic/DiagnosticSemaKinds.td
+++ b/clang/include/clang/Basic/DiagnosticSemaKinds.td
@@ -1836,7 +1836,7 @@ def ext_typecheck_convert_incompatible_pointer : ExtWarn<
   "incompatible pointer types %2 %1, expected %0">;
 def ext_typecheck_convert_discards_qualifiers : ExtWarn<
   "%2 %1 discards qualifiers, expected %0">;
-def err_nested_pointer_qualifier_mismatch : Error<
+def ext_nested_pointer_qualifier_mismatch : ExtWarn<
   "%2, %0 and %1 have different qualifiers in nested pointer types">;
 def warn_incompatible_vectors : Warning<
   "incompatible vector types %2 %1, expected %0">,
diff --git a/clang/lib/Sema/SemaExpr.cpp b/clang/lib/Sema/SemaExpr.cpp
index 887a4c4af49c..34b9eb843bb6 100644
--- a/clang/lib/Sema/SemaExpr.cpp
+++ b/clang/lib/Sema/SemaExpr.cpp
@@ -6242,7 +6242,7 @@ bool Sema::DiagnoseAssignmentResult(AssignConvertType ConvTy,
     DiagKind = diag::ext_typecheck_convert_discards_qualifiers;
     break;
   case IncompatibleNestedPointerQualifiers:
-    DiagKind = diag::err_nested_pointer_qualifier_mismatch;
+    DiagKind = diag::ext_nested_pointer_qualifier_mismatch;
     break;
   case IntToBlockPointer:
     DiagKind = diag::err_int_to_block_pointer;
diff --git a/clang/test/Sema/pointer-conversion.c b/clang/test/Sema/pointer-conversion.c
index 07176e61df06..5f41ff67411b 100644
--- a/clang/test/Sema/pointer-conversion.c
+++ b/clang/test/Sema/pointer-conversion.c
@@ -1,10 +1,10 @@
 //RUN: clang-cc -fsyntax-only -verify %s
 
 char * c;
-char const ** c2 = &c; // expected-error {{initializing, 'char const **' and 'char **' have different qualifiers in nested pointer types}}
+char const ** c2 = &c; // expected-warning {{initializing, 'char const **' and 'char **' have different qualifiers in nested pointer types}}
 
 typedef char dchar;
-dchar *** c3 = &c2; // expected-error {{initializing, 'dchar ***' and 'char const ***' have different qualifiers in nested pointer types}}
+dchar *** c3 = &c2; // expected-warning {{initializing, 'dchar ***' and 'char const ***' have different qualifiers in nested pointer types}}
 
 volatile char * c4;
-char ** c5 = &c4; // expected-error {{initializing, 'char **' and 'char volatile **' have different qualifiers in nested pointer types}}
+char ** c5 = &c4; // expected-warning {{initializing, 'char **' and 'char volatile **' have different qualifiers in nested pointer types}}