diff --git a/include/clang/Driver/Options.td b/include/clang/Driver/Options.td
index dd2ef31..bdd398d 100644
--- a/include/clang/Driver/Options.td
+++ b/include/clang/Driver/Options.td
@@ -1165,7 +1165,7 @@
 def _output_class_directory : Separate<["--"], "output-class-directory">, Alias<foutput_class_dir_EQ>;
 def _output_EQ : Joined<["--"], "output=">, Alias<o>;
 def _output : Separate<["--"], "output">, Alias<o>;
-def _param : Separate<["--"], "param">;
+def _param : Separate<["--"], "param">, Group<CompileOnly_Group>;
 def _param_EQ : Joined<["--"], "param=">, Alias<_param>;
 def _prefix_EQ : Joined<["--"], "prefix=">, Alias<B>;
 def _prefix : Separate<["--"], "prefix">, Alias<B>;
diff --git a/test/Driver/claim-unused.c b/test/Driver/claim-unused.c
new file mode 100644
index 0000000..c7b7989
--- /dev/null
+++ b/test/Driver/claim-unused.c
@@ -0,0 +1,3 @@
+// RUN: touch %t.o
+// RUN: %clang --param ssp-buffer-size=1 %t.o -### 2>&1 | FileCheck %s
+// CHECK-NOT: warning: argument unused during compilation: '--param ssp-buffer-size=1'