diff --git a/scd/ChangeLog b/scd/ChangeLog
index b6516527a..d4b71a636 100644
--- a/scd/ChangeLog
+++ b/scd/ChangeLog
@@ -1,3 +1,8 @@
+2006-09-24  Marcus Brinkmann  <marcus@g10code.de>
+
+	* app-openpgp.c (do_sign): Advance INDATA by the SHA1 resp. RMD160
+	prefix length.
+
 2006-09-14  Werner Koch  <wk@g10code.com>
 
  	Replaced all call gpg_error_from_errno(errno) by
diff --git a/scd/app-openpgp.c b/scd/app-openpgp.c
index 0db21781e..597ef437c 100644
--- a/scd/app-openpgp.c
+++ b/scd/app-openpgp.c
@@ -2116,10 +2116,16 @@ do_sign (app_t app, const char *keyidstr, int hashalgo,
     ;
   else if (indatalen == (15 + 20) && hashalgo == GCRY_MD_SHA1
            && !memcmp (indata, sha1_prefix, 15))
-    ;
+    {
+      indata += 15;
+      indatalen -= 15;
+    }
   else if (indatalen == (15 + 20) && hashalgo == GCRY_MD_RMD160
            && !memcmp (indata, rmd160_prefix, 15))
-    ;
+    {
+      indata += 15;
+      indatalen -= 15;
+    }
   else
     {
       log_error (_("card does not support digest algorithm %s\n"),