diff --git a/fs/Kconfig b/fs/Kconfig
index e9749b0eecd8..9a4158f2a3ac 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -1567,6 +1567,7 @@ config RPCSEC_GSS_SPKM3
 	select CRYPTO
 	select CRYPTO_MD5
 	select CRYPTO_DES
+	select CRYPTO_CAST5
 	help
 	  Provides for secure RPC calls by means of a gss-api
 	  mechanism based on the SPKM3 public-key mechanism.