diff --git a/geocoder/google.py b/geocoder/google.py
index ea8160a3..d5ba8b30 100755
--- a/geocoder/google.py
+++ b/geocoder/google.py
@@ -170,7 +170,7 @@ class GoogleQuery(MultipleResultsQuery):
     _URL = 'https://maps.googleapis.com/maps/api/geocode/json'
     _RESULT_CLASS = GoogleResult
     _KEY = google_key
-    _KEY_MANDATORY = False
+    _KEY_MANDATORY = True
 
     def _build_params(self, location, provider_key, **kwargs):
         params = self._location_init(location, **kwargs)
diff --git a/geocoder/google_elevation.py b/geocoder/google_elevation.py
index d7bd4b6a..248d737d 100644
--- a/geocoder/google_elevation.py
+++ b/geocoder/google_elevation.py
@@ -61,10 +61,15 @@ class ElevationQuery(MultipleResultsQuery):
     _KEY = google_key
 
     def _build_params(self, location, provider_key, **kwargs):
-        return {
-            'locations': str(Location(location)),
+        params = {
+            # required
+            'key': provider_key,
+
+            'locations': str(Location(location))
         }
 
+        return params
+
     def _adapt_results(self, json_response):
         return json_response['results']
 
diff --git a/geocoder/google_timezone.py b/geocoder/google_timezone.py
index a54d8137..6b9da5f1 100644
--- a/geocoder/google_timezone.py
+++ b/geocoder/google_timezone.py
@@ -54,11 +54,16 @@ class TimezoneQuery(MultipleResultsQuery):
     _KEY = google_key
 
     def _build_params(self, location, provider_key, **kwargs):
-        return {
+        params = {
+            # required
+            'key': provider_key,
+
             'location': str(Location(location)),
             'timestamp': kwargs.get('timestamp', time.time()),
         }
 
+        return params
+
     def _adapt_results(self, json_response):
         return [json_response]