diff --git a/pymongo/encryption.py b/pymongo/encryption.py
index 1986f5f50..d9afe048b 100644
--- a/pymongo/encryption.py
+++ b/pymongo/encryption.py
@@ -387,7 +387,7 @@ class ClientEncryption(object):
             raise ConfigurationError(
                 "client side encryption requires the pymongocrypt library: "
                 "install a compatible version with: "
-                "python -m pip install pymongo['encryption']")
+                "python -m pip install 'pymongo[encryption]'")
 
         if not isinstance(codec_options, CodecOptions):
             raise TypeError("codec_options must be an instance of "
diff --git a/pymongo/encryption_options.py b/pymongo/encryption_options.py
index bc469f0ea..60bb41e33 100644
--- a/pymongo/encryption_options.py
+++ b/pymongo/encryption_options.py
@@ -115,7 +115,7 @@ class AutoEncryptionOpts(object):
             raise ConfigurationError(
                 "client side encryption requires the pymongocrypt library: "
                 "install a compatible version with: "
-                "python -m pip install pymongo['encryption']")
+                "python -m pip install 'pymongo[encryption]'")
 
         self._kms_providers = kms_providers
         self._key_vault_namespace = key_vault_namespace