diff --git a/lldb/source/Commands/Options.td b/lldb/source/Commands/Options.td
--- a/lldb/source/Commands/Options.td
+++ b/lldb/source/Commands/Options.td
@@ -18,8 +18,7 @@
 }
 
 let Command = "settings set" in {
-  def setset_global : Option<"global", "g">, Arg<"Filename">,
-    Completion<"DiskFile">,
+  def setset_global : Option<"global", "g">,
     Desc<"Apply the new value to the global default value.">;
   def setset_force : Option<"force", "f">,
     Desc<"Force an empty value to be accepted as the default.">;
diff --git a/lldb/test/Shell/Settings/TestSettingsSet.test b/lldb/test/Shell/Settings/TestSettingsSet.test
--- a/lldb/test/Shell/Settings/TestSettingsSet.test
+++ b/lldb/test/Shell/Settings/TestSettingsSet.test
@@ -3,6 +3,11 @@
 # Check that setting an empty value with -f(orce) clears the value.
 # RUN: not %lldb -b -s %s 2>&1 | FileCheck %s
 
+# Make sure that "settings set -g" no longer requires a bogus filename.
+settings set -g target.skip-prologue false
+settings show target.skip-prologue
+# CHECK: target.skip-prologue (boolean) = false
+
 settings set tab-size 16
 settings show tab-size
 # CHECK: tab-size (unsigned) = 16