diff --git a/src/gps/GPS.cpp b/src/gps/GPS.cpp
index 4446540a3..0019bf307 100644
--- a/src/gps/GPS.cpp
+++ b/src/gps/GPS.cpp
@@ -80,6 +80,8 @@ GPS::~GPS()
     notifyDeepSleepObserver.unobserve();
 }
 
+bool GPS::hasLock() { return hasValidLocation; }
+
 // Allow defining the polarity of the WAKE output.  default is active high
 #ifndef GPS_WAKE_ACTIVE
 #define GPS_WAKE_ACTIVE 1
diff --git a/src/gps/GPS.h b/src/gps/GPS.h
index 6de72f29c..63d594863 100644
--- a/src/gps/GPS.h
+++ b/src/gps/GPS.h
@@ -57,8 +57,8 @@ class GPS : private concurrency::OSThread
      */
     virtual bool setup();
 
-    /// Returns ture if we have acquired GPS lock.
-    bool hasLock() const { return hasValidLocation; }
+    /// Returns true if we have acquired GPS lock.
+    virtual bool hasLock();
 
     /// Return true if we are connected to a GPS
     bool isConnected() const { return hasGPS; }