diff --git a/g10/main.h b/g10/main.h
index 06cbfc8d8..05ec8c26a 100644
--- a/g10/main.h
+++ b/g10/main.h
@@ -99,6 +99,7 @@ void print_sha1_keysig_rejected_note (void);
 void print_reported_error (gpg_error_t err, gpg_err_code_t skip_if_ec);
 void print_further_info (const char *format, ...) GPGRT_ATTR_PRINTF(1,2);
 void additional_weak_digest (const char* digestname);
+int  is_weak_digest (digest_algo_t algo);
 
 /*-- armor.c --*/
 char *make_radix64_string( const byte *data, size_t len );
diff --git a/g10/misc.c b/g10/misc.c
index 67a2f1928..c7107be06 100644
--- a/g10/misc.c
+++ b/g10/misc.c
@@ -331,12 +331,11 @@ print_cipher_algo_note (cipher_algo_t algo)
 void
 print_digest_algo_note (digest_algo_t algo)
 {
-  const enum gcry_md_algos galgo = map_md_openpgp_to_gcry (algo);
-  const struct weakhash *weak;
-
   if(algo >= 100 && algo <= 110)
     {
       static int warn=0;
+      const enum gcry_md_algos galgo = map_md_openpgp_to_gcry (algo);
+
       if(!warn)
 	{
 	  warn=1;
@@ -345,14 +344,13 @@ print_digest_algo_note (digest_algo_t algo)
                     gcry_md_algo_name (galgo));
 	}
     }
-  else
-      for (weak = opt.weak_digests; weak != NULL; weak = weak->next)
-        if (weak->algo == galgo)
-          {
-            es_fflush (es_stdout);
-            log_info (_("WARNING: digest algorithm %s is deprecated\n"),
-                      gcry_md_algo_name (galgo));
-          }
+  else if (is_weak_digest (algo))
+    {
+      const enum gcry_md_algos galgo = map_md_openpgp_to_gcry (algo);
+      es_fflush (es_stdout);
+      log_info (_("WARNING: digest algorithm %s is deprecated\n"),
+                gcry_md_algo_name (galgo));
+    }
 }
 
 
@@ -1908,3 +1906,17 @@ additional_weak_digest (const char* digestname)
   weak->next = opt.weak_digests;
   opt.weak_digests = weak;
 }
+
+
+/* Return true if ALGO is in the list of weak digests.  */
+int
+is_weak_digest (digest_algo_t algo)
+{
+  const enum gcry_md_algos galgo = map_md_openpgp_to_gcry (algo);
+  const struct weakhash *weak;
+
+  for (weak = opt.weak_digests; weak; weak = weak->next)
+    if (weak->algo == galgo)
+      return 1;
+  return 0;
+}
diff --git a/g10/sig-check.c b/g10/sig-check.c
index 438fc0cf9..8dd18b2e2 100644
--- a/g10/sig-check.c
+++ b/g10/sig-check.c
@@ -488,16 +488,14 @@ check_signature_end_simple (PKT_public_key *pk, PKT_signature *sig,
 {
   gcry_mpi_t result = NULL;
   int rc = 0;
-  const struct weakhash *weak;
 
   if (!opt.flags.allow_weak_digest_algos)
     {
-      for (weak = opt.weak_digests; weak; weak = weak->next)
-        if (sig->digest_algo == weak->algo)
-          {
-            print_digest_rejected_note(sig->digest_algo);
-            return GPG_ERR_DIGEST_ALGO;
-          }
+      if (is_weak_digest (sig->digest_algo))
+        {
+          print_digest_rejected_note (sig->digest_algo);
+          return GPG_ERR_DIGEST_ALGO;
+        }
     }
 
   /* For key signatures check that the key has a cert usage.  We may
diff --git a/g10/sign.c b/g10/sign.c
index 9fa11c564..d92531eb2 100644
--- a/g10/sign.c
+++ b/g10/sign.c
@@ -646,7 +646,7 @@ hash_for (PKT_public_key *pk)
     {
       return opt.def_digest_algo;
     }
-  else if (recipient_digest_algo)
+  else if (recipient_digest_algo && !is_weak_digest (recipient_digest_algo))
     {
       return recipient_digest_algo;
     }
@@ -1204,6 +1204,7 @@ sign_file (ctrl_t ctrl, strlist_t filenames, int detached, strlist_t locusr,
               && ((algo = select_algo_from_prefs (pk_list, PREFTYPE_HASH,
                                                   -1, &hint)) > 0))
             {
+              /* Note that we later check that the algo is not weak.  */
               recipient_digest_algo = algo;
             }
         }