diff --git a/clang/lib/AST/Type.cpp b/clang/lib/AST/Type.cpp
--- a/clang/lib/AST/Type.cpp
+++ b/clang/lib/AST/Type.cpp
@@ -2667,7 +2667,7 @@
   return llvm::all_of(Decl->bases(),
                       [](const CXXBaseSpecifier &BS) {
                         if (const auto *RD = BS.getType()->getAsCXXRecordDecl())
-                          HasNonDeletedDefaultedEqualityComparison(RD);
+                          return HasNonDeletedDefaultedEqualityComparison(RD);
                         return true;
                       }) &&
          llvm::all_of(Decl->fields(), [](const FieldDecl *FD) {
diff --git a/clang/test/SemaCXX/type-traits.cpp b/clang/test/SemaCXX/type-traits.cpp
--- a/clang/test/SemaCXX/type-traits.cpp
+++ b/clang/test/SemaCXX/type-traits.cpp
@@ -3264,6 +3264,21 @@
 };
 static_assert(!__is_trivially_equality_comparable(NotTriviallyEqualityComparableHasReferenceMember));
 
+struct NotTriviallyEqualityComparableNonTriviallyComparableBaseBase {
+  int i;
+
+  bool operator==(const NotTriviallyEqualityComparableNonTriviallyComparableBaseBase&) const {
+    return true;
+  }
+};
+
+struct NotTriviallyEqualityComparableNonTriviallyComparableBase : NotTriviallyEqualityComparableNonTriviallyComparableBaseBase {
+  int i;
+
+  bool operator==(const NotTriviallyEqualityComparableNonTriviallyComparableBase&) const = default;
+};
+static_assert(!__is_trivially_equality_comparable(NotTriviallyEqualityComparableNonTriviallyComparableBase));
+
 enum E {
   a,
   b