diff --git a/NEWS b/NEWS
index 3fea6662b..b6a7282ee 100644
--- a/NEWS
+++ b/NEWS
@@ -3,6 +3,12 @@ For full details, see the git log at: https://github.com/ksh93/ksh
 
 Any uppercase BUG_* names are modernish shell bug IDs.
 
+2021-06-03:
+
+- Fixed a bug in the [[ compound command: the '!' logical negation operator
+  now correctly negates another '!', e.g., [[ ! ! 1 -eq 1 ]] now returns
+  0/true. Note that this has always been the case for 'test'/'['.
+
 2021-05-18:
 
 - Fixed SHLVL so that replacing ksh by itself (exec ksh) will not increase it.
diff --git a/src/cmd/ksh93/COMPATIBILITY b/src/cmd/ksh93/COMPATIBILITY
index b6b35809b..94154d6b6 100644
--- a/src/cmd/ksh93/COMPATIBILITY
+++ b/src/cmd/ksh93/COMPATIBILITY
@@ -147,6 +147,10 @@ For more details, see the NEWS file and for complete details, see the git log.
 	zero instead of negative infinity. Previously, int() was an alias to
 	floor(), but now it behaves like trunc().
 
+27.	The '!' logical negation operator in the '[[' compound command now
+	correctly negates another '!', e.g., [[ ! ! 1 -eq 1 ]] now returns
+	0/true. Note that this has always been the case for 'test'/'['.
+
 ____________________________________________________________________________
 
 		KSH-93 VS. KSH-88
diff --git a/src/cmd/ksh93/include/version.h b/src/cmd/ksh93/include/version.h
index 420bc1910..ff36c716e 100644
--- a/src/cmd/ksh93/include/version.h
+++ b/src/cmd/ksh93/include/version.h
@@ -21,7 +21,7 @@
 
 #define SH_RELEASE_FORK	"93u+m"		/* only change if you develop a new ksh93 fork */
 #define SH_RELEASE_SVER	"1.0.0-beta.2"	/* semantic version number: https://semver.org */
-#define SH_RELEASE_DATE	"2021-05-18"	/* must be in this format for $((.sh.version)) */
+#define SH_RELEASE_DATE	"2021-06-03"	/* must be in this format for $((.sh.version)) */
 #define SH_RELEASE_CPYR	"(c) 2020-2021 Contributors to ksh " SH_RELEASE_FORK
 
 /* Scripts sometimes field-split ${.sh.version}, so don't change amount of whitespace. */
diff --git a/src/cmd/ksh93/sh/parse.c b/src/cmd/ksh93/sh/parse.c
index bfeb477b3..d63ea13c2 100644
--- a/src/cmd/ksh93/sh/parse.c
+++ b/src/cmd/ksh93/sh/parse.c
@@ -1916,7 +1916,7 @@ static Shnode_t *test_primary(Lex_t *lexp)
 	    case '!':
 		if(!(t = test_primary(lexp)))
 			sh_syntax(lexp);
-		t->tre.tretyp |= TNEGATE;
+		t->tre.tretyp ^= TNEGATE;  /* xor it, so that a '!' negates another '!' */
 		return(t);
 	    case TESTUNOP:
 		if(sh_lex(lexp))
diff --git a/src/cmd/ksh93/tests/bracket.sh b/src/cmd/ksh93/tests/bracket.sh
index 675c8d6b8..479468fcc 100755
--- a/src/cmd/ksh93/tests/bracket.sh
+++ b/src/cmd/ksh93/tests/bracket.sh
@@ -411,5 +411,17 @@ unset foo
 foo=10
 ([[ foo -eq 10 ]]) || err_exit 'foo -eq 10 fails in [[ ... ]] with foo=10'
 
+# ======
+# The negator should negate the negator
+# This bug was shared with bash:
+# https://lists.gnu.org/archive/html/bug-bash/2021-06/msg00006.html
+[[ ! ! -n x ]] && ! [[ ! ! ! -n x ]] && [[ ! ! ! ! -n x ]] && ! [[ ! ! ! ! ! -n x ]] \
+&& [[ ! ! -n x && ! ! ! ! -n x && ! ! ! ! ! ! -n x ]] \
+|| err_exit '! does not negate ! in [[ ... ]]'
+# The bug did not exist in 'test'/'[', but check for it anyway
+[ ! ! -n x ] && ! [ ! ! ! -n x ] && [ ! ! ! ! -n x ] && ! [ ! ! ! ! ! -n x ] \
+&& [ ! ! -n x -a ! ! ! ! -n x -a ! ! ! ! ! ! -n x ] \
+|| err_exit '! does not negate ! in [ ... ]'
+
 # ======
 exit $((Errors<125?Errors:125))