diff --git a/clang/lib/Format/FormatToken.h b/clang/lib/Format/FormatToken.h
--- a/clang/lib/Format/FormatToken.h
+++ b/clang/lib/Format/FormatToken.h
@@ -584,8 +584,12 @@
   }
 
   bool isAccessSpecifier(bool ColonRequired = true) const {
-    return isOneOf(tok::kw_public, tok::kw_protected, tok::kw_private) &&
-           (!ColonRequired || (Next && Next->is(tok::colon)));
+    if (!isOneOf(tok::kw_public, tok::kw_protected, tok::kw_private))
+      return false;
+    if (!ColonRequired)
+      return true;
+    const auto NextNonComment = getNextNonComment();
+    return NextNonComment && NextNonComment->is(tok::colon);
   }
 
   bool canBePointerOrReferenceQualifier() const {
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
@@ -24799,6 +24799,11 @@
                "    int i;\n"
                "};\n",
                Style);
+  verifyFormat("class C {\n"
+               "  public /* comment */:\n"
+               "    int i;\n"
+               "};",
+               Style);
   verifyFormat("struct S {\n"
                "  private:\n"
                "    class C {\n"
@@ -24827,6 +24832,11 @@
                "      int i;\n"
                "};\n",
                Style);
+  verifyFormat("class C {\n"
+               "   public /**/:\n"
+               "      int i;\n"
+               "};",
+               Style);
 }
 
 TEST_F(FormatTest, LimitlessStringsAndComments) {