diff --git a/contrib/pgcrypto/expected/pgp-decrypt.out b/contrib/pgcrypto/expected/pgp-decrypt.out
index 859f4d681b..7193dca026 100644
--- a/contrib/pgcrypto/expected/pgp-decrypt.out
+++ b/contrib/pgcrypto/expected/pgp-decrypt.out
@@ -364,3 +364,11 @@ a3nsOzKTXUfS9VyaXo8IrncM6n7fdaXpwba/3tNsAhJG4lDv1k4g9v8Ix2dfv6Rs
 (1 row)
 
 -- expected: 7efefcab38467f7484d6fa43dc86cf5281bd78e2
+-- check BUG #11905, problem with messages 6 less than a power of 2.
+select pgp_sym_decrypt(pgp_sym_encrypt(repeat('x',65530),'1'),'1') = repeat('x',65530);
+ ?column? 
+----------
+ t
+(1 row)
+
+-- expected: true
diff --git a/contrib/pgcrypto/pgp-decrypt.c b/contrib/pgcrypto/pgp-decrypt.c
index e03ee7f5f0..1fd7cf3976 100644
--- a/contrib/pgcrypto/pgp-decrypt.c
+++ b/contrib/pgcrypto/pgp-decrypt.c
@@ -182,7 +182,7 @@ pktreader_pull(void *priv, PullFilter *src, int len,
 	if (pkt->type == PKT_CONTEXT)
 		return pullf_read(src, len, data_p);
 
-	if (pkt->len == 0)
+	while (pkt->len == 0)
 	{
 		/* this was last chunk in stream */
 		if (pkt->type == PKT_NORMAL)
diff --git a/contrib/pgcrypto/sql/pgp-decrypt.sql b/contrib/pgcrypto/sql/pgp-decrypt.sql
index 93535ab016..5457152ccf 100644
--- a/contrib/pgcrypto/sql/pgp-decrypt.sql
+++ b/contrib/pgcrypto/sql/pgp-decrypt.sql
@@ -264,3 +264,7 @@ a3nsOzKTXUfS9VyaXo8IrncM6n7fdaXpwba/3tNsAhJG4lDv1k4g9v8Ix2dfv6Rs
 -----END PGP MESSAGE-----
 '), 'key', 'convert-crlf=1'), 'sha1'), 'hex');
 -- expected: 7efefcab38467f7484d6fa43dc86cf5281bd78e2
+
+-- check BUG #11905, problem with messages 6 less than a power of 2.
+select pgp_sym_decrypt(pgp_sym_encrypt(repeat('x',65530),'1'),'1') = repeat('x',65530);
+-- expected: true