diff --git a/clang/include/clang/Driver/Options.def b/clang/include/clang/Driver/Options.def
index 1421b6e1f0c7..36bbfbc6f5b2 100644
--- a/clang/include/clang/Driver/Options.def
+++ b/clang/include/clang/Driver/Options.def
@@ -519,7 +519,7 @@ OPTION("-g", g_Flag, Flag, g_Group, INVALID, "", 0, 0, 0)
 OPTION("-g", g_Joined, Joined, g_Group, INVALID, "", 0, 0, 0)
 OPTION("-headerpad_max_install_names", headerpad__max__install__names, Joined, INVALID, INVALID, "", 0, 0, 0)
 OPTION("-idirafter", idirafter, JoinedOrSeparate, clang_i_Group, INVALID, "", 0, 0, 0)
-OPTION("-imacros", imacros, JoinedOrSeparate, i_Group, INVALID, "", 0, 0, 0)
+OPTION("-imacros", imacros, JoinedOrSeparate, clang_i_Group, INVALID, "", 0, 0, 0)
 OPTION("-image_base", image__base, Separate, INVALID, INVALID, "", 0, 0, 0)
 OPTION("-include", include, JoinedOrSeparate, clang_i_Group, INVALID, "", 0, 0, 0)
 OPTION("-init", init, Separate, INVALID, INVALID, "", 0, 0, 0)