diff --git a/lib/Format/Format.cpp b/lib/Format/Format.cpp
index 1a7dbe0936..b1005b5de6 100644
--- a/lib/Format/Format.cpp
+++ b/lib/Format/Format.cpp
@@ -1324,7 +1324,8 @@ public:
           unsigned LevelIndent = Indent;
           if (static_cast<int>(LevelIndent) - Offset >= 0)
             LevelIndent -= Offset;
-          IndentForLevel[TheLine.Level] = LevelIndent;
+          if (TheLine.First.isNot(tok::comment))
+            IndentForLevel[TheLine.Level] = LevelIndent;
 
           // Remove trailing whitespace of the previous line if it was touched.
           if (PreviousLineWasTouched || touchesEmptyLineBefore(TheLine))
diff --git a/unittests/Format/FormatTest.cpp b/unittests/Format/FormatTest.cpp
index 7f9cecb031..40f09539e7 100644
--- a/unittests/Format/FormatTest.cpp
+++ b/unittests/Format/FormatTest.cpp
@@ -3279,6 +3279,13 @@ TEST_F(FormatTest, ReformatRegionAdjustsIndent) {
             format("void f() {}\n"
                    "void g() {}",
                    13, 0, getLLVMStyle()));
+  EXPECT_EQ("int a; // comment\n"
+            "       // line 2\n"
+            "int b;",
+            format("int a; // comment\n"
+                   "       // line 2\n"
+                   "  int b;",
+                   35, 0, getLLVMStyle()));
 }
 
 TEST_F(FormatTest, BreakStringLiterals) {