diff --git a/docker/client.py b/docker/client.py
index c16f314a..aba066ba 100644
--- a/docker/client.py
+++ b/docker/client.py
@@ -60,7 +60,7 @@ class Client(
         )
         if base_url.startswith('http+unix://'):
             self._custom_adapter = UnixAdapter(
-                base_url, timeout, num_pools=num_pools
+                base_url, timeout, pool_connections=num_pools
             )
             self.mount('http+docker://', self._custom_adapter)
             self._unmount('http://', 'https://')
@@ -72,7 +72,7 @@ class Client(
                 )
             try:
                 self._custom_adapter = NpipeAdapter(
-                    base_url, timeout, num_pools=num_pools
+                    base_url, timeout, pool_connections=num_pools
                 )
             except NameError:
                 raise errors.DockerException(
diff --git a/docker/transport/npipeconn.py b/docker/transport/npipeconn.py
index 917fa8b3..984049c7 100644
--- a/docker/transport/npipeconn.py
+++ b/docker/transport/npipeconn.py
@@ -49,11 +49,11 @@ class NpipeHTTPConnectionPool(urllib3.connectionpool.HTTPConnectionPool):
 
 class NpipeAdapter(requests.adapters.HTTPAdapter):
     def __init__(self, base_url, timeout=60,
-                 num_pools=constants.DEFAULT_NUM_POOLS):
+                 pool_connections=constants.DEFAULT_NUM_POOLS):
         self.npipe_path = base_url.replace('npipe://', '')
         self.timeout = timeout
         self.pools = RecentlyUsedContainer(
-            num_pools, dispose_func=lambda p: p.close()
+            pool_connections, dispose_func=lambda p: p.close()
         )
         super(NpipeAdapter, self).__init__()
 
diff --git a/docker/transport/unixconn.py b/docker/transport/unixconn.py
index b7905a04..978c87a1 100644
--- a/docker/transport/unixconn.py
+++ b/docker/transport/unixconn.py
@@ -51,14 +51,14 @@ class UnixHTTPConnectionPool(urllib3.connectionpool.HTTPConnectionPool):
 
 class UnixAdapter(requests.adapters.HTTPAdapter):
     def __init__(self, socket_url, timeout=60,
-                 num_pools=constants.DEFAULT_NUM_POOLS):
+                 pool_connections=constants.DEFAULT_NUM_POOLS):
         socket_path = socket_url.replace('http+unix://', '')
         if not socket_path.startswith('/'):
             socket_path = '/' + socket_path
         self.socket_path = socket_path
         self.timeout = timeout
         self.pools = RecentlyUsedContainer(
-            num_pools, dispose_func=lambda p: p.close()
+            pool_connections, dispose_func=lambda p: p.close()
         )
         super(UnixAdapter, self).__init__()