diff --git a/clang/lib/Format/UnwrappedLineParser.cpp b/clang/lib/Format/UnwrappedLineParser.cpp
index 758f8193ca4f..07ad7a7489e0 100644
--- a/clang/lib/Format/UnwrappedLineParser.cpp
+++ b/clang/lib/Format/UnwrappedLineParser.cpp
@@ -404,7 +404,8 @@ void UnwrappedLineParser::parseParens() {
 void UnwrappedLineParser::parseIfThenElse() {
   assert(FormatTok.Tok.is(tok::kw_if) && "'if' expected");
   nextToken();
-  parseParens();
+  if (FormatTok.Tok.is(tok::l_paren))
+    parseParens();
   bool NeedsUnwrappedLine = false;
   if (FormatTok.Tok.is(tok::l_brace)) {
     parseBlock();
diff --git a/clang/unittests/Format/FormatTest.cpp b/clang/unittests/Format/FormatTest.cpp
index 71fa83ccb140..6beee3186b72 100644
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/unittests/Format/FormatTest.cpp
@@ -1108,6 +1108,10 @@ TEST_F(FormatTest, IncorrectCodeDoNoWhile) {
                "}");
 }
 
+TEST_F(FormatTest, IncorrectIf) {
+  verifyFormat("if {\n  foo;\n  foo();\n}");
+}
+
 TEST_F(FormatTest, DoesNotTouchUnwrappedLinesWithErrors) {
   verifyFormat("namespace {\n"
                "class Foo {  Foo  ( }; }  // comment");