diff --git a/clang/lib/Format/Format.cpp b/clang/lib/Format/Format.cpp
--- a/clang/lib/Format/Format.cpp
+++ b/clang/lib/Format/Format.cpp
@@ -1895,26 +1895,31 @@
   void removeBraces(SmallVectorImpl<AnnotatedLine *> &Lines,
                     tooling::Replacements &Result) {
     const auto &SourceMgr = Env.getSourceManager();
+    bool EndsWithComment = false;
     for (AnnotatedLine *Line : Lines) {
       removeBraces(Line->Children, Result);
-      if (!Line->Affected)
-        continue;
-      for (FormatToken *Token = Line->First; Token && !Token->Finalized;
-           Token = Token->Next) {
-        if (!Token->Optional)
-          continue;
-        assert(Token->isOneOf(tok::l_brace, tok::r_brace));
-        assert(Token->Next || Token == Line->Last);
-        const auto Start =
-            Token == Line->Last ||
-                    (Token->Next->isOneOf(tok::kw_else, tok::comment) &&
-                     Token->Next->NewlinesBefore > 0)
-                ? Token->WhitespaceRange.getBegin()
-                : Token->Tok.getLocation();
-        const auto Range =
-            CharSourceRange::getCharRange(Start, Token->Tok.getEndLoc());
-        cantFail(Result.add(tooling::Replacement(SourceMgr, Range, "")));
+      if (Line->Affected) {
+        for (FormatToken *Token = Line->First; Token && !Token->Finalized;
+             Token = Token->Next) {
+          if (!Token->Optional)
+            continue;
+          assert(Token->isOneOf(tok::l_brace, tok::r_brace));
+          assert(Token->Previous || Token == Line->First);
+          const FormatToken *Next = Token->Next;
+          assert(Next || Token == Line->Last);
+          const auto Start =
+              (!Token->Previous && EndsWithComment) ||
+                      (Next && !(Next->isOneOf(tok::kw_else, tok::comment) &&
+                                 Next->NewlinesBefore > 0))
+                  ? Token->Tok.getLocation()
+                  : Token->WhitespaceRange.getBegin();
+          const auto Range =
+              CharSourceRange::getCharRange(Start, Token->Tok.getEndLoc());
+          cantFail(Result.add(tooling::Replacement(SourceMgr, Range, "")));
+        }
       }
+      assert(Line->Last);
+      EndsWithComment = Line->Last->is(tok::comment);
     }
   }
 };
diff --git a/clang/unittests/Format/FormatTest.cpp b/clang/unittests/Format/FormatTest.cpp
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/unittests/Format/FormatTest.cpp
@@ -25741,6 +25741,17 @@
                "}",
                Style);
 
+  verifyFormat("if (a) {\n"
+               "  if (b)\n"
+               "    c = 1; // comment\n"
+               "}",
+               "if (a) {\n"
+               "  if (b) {\n"
+               "    c = 1; // comment\n"
+               "  }\n"
+               "}",
+               Style);
+
   verifyFormat("if (a) {\n"
                "Label:\n"
                "}",