$ gpgtar --version
gpgtar (GnuPG) 2.4.1-beta7

$ gpgtar --decrypt <~/dev/g10/testdata/decrypt-me-sym.tar.asc 
Usage: gpgtar [options] [files] [directories] (-h for help)

$ gpgtar --decrypt - <~/dev/g10/testdata/decrypt-me-sym.tar.asc 
gpg: decrypt_message failed: Unknown system error
gpgtar: error reading '[?]': premature EOF (size of last record: 0)

$ ls -lR -- -_1_
-_1_:
total 0

diff --git a/tools/gpgtar.c b/tools/gpgtar.c
index 8461666b9..252d80c1d 100644
--- a/tools/gpgtar.c
+++ b/tools/gpgtar.c
@@ -531,7 +531,7 @@ main (int argc, char **argv)
       break;
 
     case aDecrypt:
-      if (argc != 1)
+      if (argc > 1)
         gpgrt_usage (1);
       if (opt.outfile)
         log_info ("note: ignoring option --output\n");