diff --git a/src/pip/_internal/compat.py b/src/pip/_internal/compat.py
index 424f37c22..88b3451f7 100644
--- a/src/pip/_internal/compat.py
+++ b/src/pip/_internal/compat.py
@@ -202,7 +202,7 @@ if sys.version_info >= (3,3):
         cr = shutil.get_terminal_size()
         return int(cr[1]), int(cr[0])
 else:
-    def get_terminal_size()::
+    def get_terminal_size():
         def ioctl_GWINSZ(fd):
             try:
                 import fcntl