--- a/modules/libpref/Preferences.cpp
+++ b/modules/libpref/Preferences.cpp
@@ -2939,17 +2939,17 @@ TelemetryPrefValue()
     // telemetry is on by default, otherwise not. This is necessary so that
     // beta users who are testing final release builds don't flipflop defaults.
 #ifdef MOZ_TELEMETRY_ON_BY_DEFAULT
   return Some(true);
 #else
   nsAutoCString channelPrefValue;
   Unused << Preferences::GetCString(
     kChannelPref, channelPrefValue, PrefValueKind::Default);
-  return Some(prefValue.EqualsLiteral("beta"));
+  return Some(channelPrefValue.EqualsLiteral("beta"));
 #endif
 }
 
 /* static */ void
 Preferences::SetupTelemetryPref()
 {
   Maybe<bool> telemetryPrefValue = TelemetryPrefValue();
   if (telemetryPrefValue.isSome()) {