diff --git a/configure.ac b/configure.ac
index 079be839b..769c38c05 100644
--- a/configure.ac
+++ b/configure.ac
@@ -133,7 +133,7 @@ ARG_DISBL_SET([fips-prf],       [disable FIPS PRF software implementation plugin
 ARG_ENABL_SET([gcm],            [enables the GCM AEAD wrapper crypto plugin.])
 ARG_ENABL_SET([gcrypt],         [enables the libgcrypt plugin.])
 ARG_DISBL_SET([gmp],            [disable GNU MP (libgmp) based crypto implementation plugin.])
-ARG_ENABL_SET([curve25519],     [enable Curve25519 Diffie-Hellman plugin.])
+ARG_DISBL_SET([curve25519],     [disable Curve25519 Diffie-Hellman plugin.])
 ARG_DISBL_SET([hmac],           [disable HMAC crypto implementation plugin.])
 ARG_ENABL_SET([md4],            [enable MD4 software implementation plugin.])
 ARG_DISBL_SET([md5],            [disable MD5 software implementation plugin.])