diff --git a/devtools/client/preferences/debugger.js b/devtools/client/preferences/debugger.js
index 27f38d2ac6bc..e186ba4e7398 100644
--- a/devtools/client/preferences/debugger.js
+++ b/devtools/client/preferences/debugger.js
@@ -20,7 +20,7 @@ pref("devtools.debugger.auto-black-box", true);
 pref("devtools.debugger.workers", false);
 
 // The default Debugger UI settings
-pref("devtools.debugger.prefs-schema-version", "1.0.2");
+pref("devtools.debugger.prefs-schema-version", "1.0.0");
 pref("devtools.debugger.ui.panes-workers-and-sources-width", 200);
 pref("devtools.debugger.ui.panes-instruments-width", 300);
 pref("devtools.debugger.ui.panes-visible-on-startup", false);