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
@@ -718,6 +718,11 @@
   LLVMStyle.StatementMacros.push_back("Q_UNUSED");
   LLVMStyle.StatementMacros.push_back("QT_REQUIRE_VERSION");
 
+  // Defaults that differ when not C++.
+  if (Language == FormatStyle::LK_TableGen) {
+    LLVMStyle.SpacesInContainerLiterals = false;
+  }
+
   return LLVMStyle;
 }
 
diff --git a/clang/unittests/Format/FormatTestTableGen.cpp b/clang/unittests/Format/FormatTestTableGen.cpp
--- a/clang/unittests/Format/FormatTestTableGen.cpp
+++ b/clang/unittests/Format/FormatTestTableGen.cpp
@@ -51,5 +51,9 @@
                "               \"very long help string\">;\n");
 }
 
+TEST_F(FormatTestTableGen, NoSpacesInSquareBracketLists) {
+  verifyFormat("def flag : Flag<[\"-\", \"--\"], \"foo\">;\n");
+}
+
 } // namespace format
 } // end namespace clang