Index: lib/Format/TokenAnnotator.cpp
===================================================================
--- lib/Format/TokenAnnotator.cpp
+++ lib/Format/TokenAnnotator.cpp
@@ -2349,9 +2349,12 @@
                : Style.SpacesInParentheses;
   if (Right.isOneOf(tok::semi, tok::comma))
     return false;
-  if (Right.is(tok::less) && Line.Type == LT_ObjCDecl &&
-      Style.ObjCSpaceBeforeProtocolList)
-    return true;
+  if (Right.is(tok::less) && Line.Type == LT_ObjCDecl) {
+    bool IsLightweightGeneric =
+        Right.MatchingParen && Right.MatchingParen->Next &&
+        Right.MatchingParen->Next->is(tok::colon);
+    return !IsLightweightGeneric && Style.ObjCSpaceBeforeProtocolList;
+  }
   if (Right.is(tok::less) && Left.is(tok::kw_template))
     return Style.SpaceAfterTemplateKeyword;
   if (Left.isOneOf(tok::exclaim, tok::tilde))
Index: unittests/Format/FormatTestObjC.cpp
===================================================================
--- unittests/Format/FormatTestObjC.cpp
+++ unittests/Format/FormatTestObjC.cpp
@@ -299,13 +299,13 @@
                "+ (id)init;\n"
                "@end");
 
-  verifyFormat("@interface Foo <Baz : Blech> : Bar <Baz, Quux> {\n"
+  verifyFormat("@interface Foo<Baz : Blech> : Bar <Baz, Quux> {\n"
                "  int _i;\n"
                "}\n"
                "+ (id)init;\n"
                "@end");
 
-  verifyFormat("@interface Foo <Bar : Baz <Blech>> : Xyzzy <Corge> {\n"
+  verifyFormat("@interface Foo<Bar : Baz <Blech>> : Xyzzy <Corge> {\n"
                "  int _i;\n"
                "}\n"
                "+ (id)init;\n"