Index: lib/Format/TokenAnnotator.cpp
===================================================================
--- lib/Format/TokenAnnotator.cpp
+++ lib/Format/TokenAnnotator.cpp
@@ -1540,7 +1540,7 @@
         Current->MustBreakBefore || mustBreakBefore(Line, *Current);
 
     if (!Current->MustBreakBefore && InFunctionDecl &&
-        Current->is(TT_FunctionDeclarationName)) {
+        Current->isOneOf(tok::kw_operator, TT_FunctionDeclarationName)) {
       // FIXME: Line.Last points to other characters than tok::semi
       // and tok::lbrace.
       bool IsDefinition = !Line.Last->isOneOf(tok::semi, tok::comment);
Index: unittests/Format/FormatTest.cpp
===================================================================
--- unittests/Format/FormatTest.cpp
+++ unittests/Format/FormatTest.cpp
@@ -4668,6 +4668,11 @@
                "T *\n"
                "f(T &c);\n",
                Style);
+  verifyFormat("void *\n"
+               "operator new(std::size_t);",
+               Style);
+  verifyFormat("void *operator new(std::size_t) {}",
+               Style);
   Style.BreakBeforeBraces = FormatStyle::BS_Stroustrup;
   verifyFormat("const char *f(void) { return \"\"; }\n"
                "const char *\n"
@@ -4716,6 +4721,11 @@
                "}\n"
                "template <class T> T *f(T &c);\n", // No break here.
                Style);
+  verifyFormat("void *operator new(std::size_t);", // No break here.
+               Style);
+  verifyFormat("void *\n"
+               "operator new(std::size_t) {}",
+               Style);
   Style.BreakBeforeBraces = FormatStyle::BS_Stroustrup;
   verifyFormat("const char *\n"
                "f(void)\n" // Break here.