diff --git a/clang/lib/Format/TokenAnnotator.cpp b/clang/lib/Format/TokenAnnotator.cpp
--- a/clang/lib/Format/TokenAnnotator.cpp
+++ b/clang/lib/Format/TokenAnnotator.cpp
@@ -1893,6 +1893,13 @@
         LeftOfParens = LeftOfParens->MatchingParen->Previous;
       }
 
+      // The Condition directly below this one will see the operator arguments
+      // as a (void *foo) cast.
+      //   void operator delete(void *foo) ATTRIB;
+      if (LeftOfParens->Tok.getIdentifierInfo() && LeftOfParens->Previous &&
+          LeftOfParens->Previous->is(tok::kw_operator))
+        return false;
+
       // If there is an identifier (or with a few exceptions a keyword) right
       // before the parentheses, this is unlikely to be a cast.
       if (LeftOfParens->Tok.getIdentifierInfo() &&
diff --git a/clang/unittests/Format/FormatTest.cpp b/clang/unittests/Format/FormatTest.cpp
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/unittests/Format/FormatTest.cpp
@@ -9459,6 +9459,11 @@
                "    new (aaaaaaaaaaaaaaaaaaaaaaaaaa(aaaaaaaaaaaaaaaaaaaaaaa))\n"
                "        typename aaaaaaaaaaaaaaaaaaaaaaaa();");
   verifyFormat("delete[] h->p;");
+
+  verifyFormat("void operator delete(void *foo) ATTRIB;");
+  verifyFormat("void operator new(void *foo) ATTRIB;");
+  verifyFormat("void operator delete[](void *foo) ATTRIB;");
+  verifyFormat("void operator delete(void *ptr) noexcept;");
 }
 
 TEST_F(FormatTest, UnderstandsUsesOfStarAndAmp) {