diff --git a/llvm/tools/llvm-rc/Opts.td b/llvm/tools/llvm-rc/Opts.td
--- a/llvm/tools/llvm-rc/Opts.td
+++ b/llvm/tools/llvm-rc/Opts.td
@@ -7,9 +7,9 @@
 def FILEOUT : JoinedOrSeparate<[ "/", "-" ], "FO">,
               HelpText<"Change the output file location.">;
 
-def DEFINE : Separate<[ "/", "-" ], "D">,
+def DEFINE : JoinedOrSeparate<[ "/", "-" ], "D">,
              HelpText<"Define a symbol for the C preprocessor.">;
-def UNDEF : Separate<[ "/", "-" ], "U">,
+def UNDEF : JoinedOrSeparate<[ "/", "-" ], "U">,
             HelpText<"Undefine a symbol for the C preprocessor.">;
 
 def LANG_ID : Separate<[ "/", "-" ], "L">,
@@ -17,7 +17,7 @@
 def LANG_NAME : Separate<[ "/", "-" ], "LN">,
                 HelpText<"Set the default language name.">;
 
-def INCLUDE : Separate<[ "/", "-" ], "I">, HelpText<"Add an include path.">;
+def INCLUDE : JoinedOrSeparate<[ "/", "-" ], "I">, HelpText<"Add an include path.">;
 def NOINCLUDE : Flag<[ "/", "-" ], "X">, HelpText<"Ignore 'include' variable.">;
 
 def ADD_NULL : Flag<[ "/", "-" ], "N">,