diff --git a/programs/pkey/dh_client.c b/programs/pkey/dh_client.c
index 21c4a81..0978408 100644
--- a/programs/pkey/dh_client.c
+++ b/programs/pkey/dh_client.c
@@ -212,9 +212,9 @@
         goto exit;
     }
 
-    if( ( ret = mbedtls_sha1_ext( buf, (int)( p - 2 - buf ), hash ) ) != 0 )
+    if( ( ret = mbedtls_sha1_ret( buf, (int)( p - 2 - buf ), hash ) ) != 0 )
     {
-        mbedtls_printf( " failed\n  ! mbedtls_sha1_ext returned %d\n\n", ret );
+        mbedtls_printf( " failed\n  ! mbedtls_sha1_ret returned %d\n\n", ret );
         goto exit;
     }