Index: lib/Format/TokenAnnotator.cpp
===================================================================
--- lib/Format/TokenAnnotator.cpp
+++ lib/Format/TokenAnnotator.cpp
@@ -1997,7 +1997,7 @@
   if (Right.isOneOf(TT_CtorInitializerColon, TT_ObjCBlockLParen))
     return true;
   if (Right.is(TT_OverloadedOperatorLParen))
-    return false;
+    return Style.SpaceBeforeParens == FormatStyle::SBPO_Always;
   if (Right.is(tok::colon)) {
     if (Line.First->isOneOf(tok::kw_case, tok::kw_default) ||
         !Right.getNextNonComment() || Right.getNextNonComment()->is(tok::semi))
Index: unittests/Format/FormatTest.cpp
===================================================================
--- unittests/Format/FormatTest.cpp
+++ unittests/Format/FormatTest.cpp
@@ -8276,6 +8276,8 @@
   verifyFormat("static_assert(sizeof(char) == 1, \"Impossible!\");", NoSpace);
   verifyFormat("int f() throw(Deprecated);", NoSpace);
   verifyFormat("typedef void (*cb)(int);", NoSpace);
+  verifyFormat("T A::operator()();", NoSpace);
+  verifyFormat("X A::operator++(T);", NoSpace);
 
   FormatStyle Space = getLLVMStyle();
   Space.SpaceBeforeParens = FormatStyle::SBPO_Always;
@@ -8321,6 +8323,8 @@
   verifyFormat("static_assert (sizeof (char) == 1, \"Impossible!\");", Space);
   verifyFormat("int f () throw (Deprecated);", Space);
   verifyFormat("typedef void (*cb) (int);", Space);
+  verifyFormat("T A::operator() ();", Space);
+  verifyFormat("X A::operator++ (T);", Space);
 }
 
 TEST_F(FormatTest, ConfigurableSpacesInParentheses) {