diff --git a/geocoder/google.py b/geocoder/google.py
old mode 100755
new mode 100644
index ea8160a3..d5ba8b30
--- 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..7b4b0edd 100644
--- a/geocoder/google_elevation.py
+++ b/geocoder/google_elevation.py
@@ -63,6 +63,7 @@ class ElevationQuery(MultipleResultsQuery):
     def _build_params(self, location, provider_key, **kwargs):
         return {
             'locations': str(Location(location)),
+            'key': provider_key,
         }
 
     def _adapt_results(self, json_response):
diff --git a/geocoder/google_timezone.py b/geocoder/google_timezone.py
index a54d8137..268aee31 100644
--- a/geocoder/google_timezone.py
+++ b/geocoder/google_timezone.py
@@ -57,6 +57,7 @@ def _build_params(self, location, provider_key, **kwargs):
         return {
             'location': str(Location(location)),
             'timestamp': kwargs.get('timestamp', time.time()),
+            'key': provider_key,
         }
 
     def _adapt_results(self, json_response):