--- gpgme/gpgmeplug.c
+++ gpgme/gpgmeplug.c
@@ -2125,6 +2125,7 @@
     fprintf( stderr,  "startListCertificates( \"%s\", %d )\n", pattern, remote );
 
     it = xmalloc( sizeof( struct CertIterator ) );
+    memset( &(it->info), 0, sizeof( struct CertificateInfo ) );
 
     err = gpgme_new (&(it->ctx));
     /*fprintf( stderr,  "2: gpgme returned %d\n", err );*/