Index: g10/keygen.c
===================================================================
--- g10/keygen.c
+++ g10/keygen.c
@@ -3123,7 +3123,7 @@
           nbits = 0;
         }
 
-      nbits = ask_keysize (algo, nbits);
+      nbits = ask_keysize (both? subkey_algo : algo, nbits);
       r = xmalloc_clear( sizeof *r + 20 );
       r->key = both? pSUBKEYLENGTH : pKEYLENGTH;
       sprintf( r->u.value, "%u", nbits);