diff --git a/clang/include/clang/Sema/Sema.h b/clang/include/clang/Sema/Sema.h
--- a/clang/include/clang/Sema/Sema.h
+++ b/clang/include/clang/Sema/Sema.h
@@ -6036,6 +6036,7 @@
   struct OffsetOfComponent {
     SourceLocation LocStart, LocEnd;
     bool isBrackets;  // true if [expr], false if .ident
+    bool isQualifier;
     union {
       IdentifierInfo *IdentInfo;
       Expr *E;
diff --git a/clang/lib/Parse/ParseExpr.cpp b/clang/lib/Parse/ParseExpr.cpp
--- a/clang/lib/Parse/ParseExpr.cpp
+++ b/clang/lib/Parse/ParseExpr.cpp
@@ -2641,10 +2641,13 @@
 
     // FIXME: This loop leaks the index expressions on error.
     while (true) {
-      if (Tok.is(tok::period)) {
+      if (Tok.is(tok::period) || Tok.is(tok::coloncolon)) {
         // offsetof-member-designator: offsetof-member-designator '.' identifier
+        if (Tok.is(tok::coloncolon))
+          Comps.back().isQualifier = true;
         Comps.push_back(Sema::OffsetOfComponent());
         Comps.back().isBrackets = false;
+        Comps.back().isQualifier = false;
         Comps.back().LocStart = ConsumeToken();
 
         if (Tok.isNot(tok::identifier)) {
@@ -2661,6 +2664,7 @@
         // offsetof-member-designator: offsetof-member-design '[' expression ']'
         Comps.push_back(Sema::OffsetOfComponent());
         Comps.back().isBrackets = true;
+        Comps.back().isQualifier = false;
         BalancedDelimiterTracker ST(*this, tok::l_square);
         ST.consumeOpen();
         Comps.back().LocStart = ST.getOpenLocation();
diff --git a/clang/lib/Sema/SemaExpr.cpp b/clang/lib/Sema/SemaExpr.cpp
--- a/clang/lib/Sema/SemaExpr.cpp
+++ b/clang/lib/Sema/SemaExpr.cpp
@@ -16692,6 +16692,10 @@
     if (!MemberDecl) {
       if ((IndirectMemberDecl = R.getAsSingle<IndirectFieldDecl>()))
         MemberDecl = IndirectMemberDecl->getAnonField();
+
+      IdentifierInfo *II = RD->getIdentifier();
+      if (II == OC.U.IdentInfo && OC.isQualifier)
+        continue;
     }
 
     if (!MemberDecl) {
diff --git a/clang/test/Sema/offsetof.c b/clang/test/Sema/offsetof.c
--- a/clang/test/Sema/offsetof.c
+++ b/clang/test/Sema/offsetof.c
@@ -73,3 +73,8 @@
   return __builtin_offsetof(Array, array[*(int*)0]); // expected-warning{{indirection of non-volatile null pointer}} expected-note{{__builtin_trap}}
 }
 
+// https://github.com/llvm/llvm-project/issues/64154
+struct X2 { int a; };
+int x2[__builtin_offsetof(struct X2, X2::a) == 0 ? 1 : -1];
+int x3[__builtin_offsetof(struct X2, X2::X2) == 0 ? 1 : -1]; // expected-error{{no member named 'X2'}}
+