diff --git a/NEWS b/NEWS
index 5a04ba336..e261d1d0e 100644
--- a/NEWS
+++ b/NEWS
@@ -3,6 +3,11 @@ For full details, see the git log at: https://github.com/ksh93/ksh
 
 Any uppercase BUG_* names are modernish shell bug IDs.
 
+2020-09-30:
+
+- Fixed: 'typeset -xu' and 'typeset -xl' (export + change case) failed to
+  change the case of a variable's value in certain conditions.
+
 2020-09-28:
 
 - While executing a ksh-style function, ksh 93u+ ignored all signals for which
diff --git a/src/cmd/ksh93/bltins/typeset.c b/src/cmd/ksh93/bltins/typeset.c
index dff817b20..c013510dd 100644
--- a/src/cmd/ksh93/bltins/typeset.c
+++ b/src/cmd/ksh93/bltins/typeset.c
@@ -94,6 +94,7 @@ int    b_readonly(int argc,char *argv[],Shbltin_t *context)
 	memset((void*)&tdata,0,sizeof(tdata));
 	tdata.sh = context->shp;
 	tdata.aflag = '-';
+	tdata.argnum = -1;  /* tell nv_newattr() that we should not change size */
 	while((flag = optget(argv,*command=='e'?sh_optexport:sh_optreadonly))) switch(flag)
 	{
 		case 'p':
diff --git a/src/cmd/ksh93/include/version.h b/src/cmd/ksh93/include/version.h
index 901a973f4..a3870c1c8 100644
--- a/src/cmd/ksh93/include/version.h
+++ b/src/cmd/ksh93/include/version.h
@@ -17,4 +17,4 @@
 *                  David Korn <dgk@research.att.com>                   *
 *                                                                      *
 ***********************************************************************/
-#define SH_RELEASE	"93u+m 2020-09-28"
+#define SH_RELEASE	"93u+m 2020-09-30"
diff --git a/src/cmd/ksh93/sh/name.c b/src/cmd/ksh93/sh/name.c
index 59ff09d8c..11d87338b 100644
--- a/src/cmd/ksh93/sh/name.c
+++ b/src/cmd/ksh93/sh/name.c
@@ -2954,10 +2954,12 @@ void nv_newattr (register Namval_t *np, unsigned newatts, int size)
 			nv_onattr(np,NV_EXPORT);
 			sh_envput(shp->env,np);
 		}
-		if((n^newatts)==NV_EXPORT)
+		if((n^newatts)==NV_EXPORT && size==-1)
 			return;
 	}
 	oldsize = nv_size(np);
+	if(size==-1)
+		size = oldsize;
 	if((size==oldsize|| (n&NV_INTEGER)) && !trans && ((n^newatts)&~NV_NOCHANGE)==0)
 	{
 		if(size)
diff --git a/src/cmd/ksh93/tests/attributes.sh b/src/cmd/ksh93/tests/attributes.sh
index a3b61609c..d3c2e0e8d 100755
--- a/src/cmd/ksh93/tests/attributes.sh
+++ b/src/cmd/ksh93/tests/attributes.sh
@@ -30,6 +30,23 @@ integer Errors=0
 
 [[ -d $tmp && -w $tmp && $tmp == "$PWD" ]] || { err\_exit "$LINENO" '$tmp not set; run this from shtests. Aborting.'; exit 1; }
 
+# ======
+# as of 93u+, typeset -xu/-xl failed to change case in a value (rhbz#1188377)
+# (this test failed to fail when it was added at the end, so it's at the start)
+unset test_u test_xu test_txu
+typeset -u test_u=uppercase
+typeset -xu test_xu=uppercase
+typeset -txu test_txu=uppercase
+typeset -l test_l=LOWERCASE
+typeset -xl test_xl=LOWERCASE
+typeset -txl test_txl=LOWERCASE
+exp="UPPERCASE UPPERCASE UPPERCASE lowercase lowercase lowercase"
+got="${test_u} ${test_xu} ${test_txu} ${test_l} ${test_xl} ${test_txl}"
+[[ $got == "$exp" ]] || err_exit "typeset failed to change case in variable" \
+	"(expected $(printf %q "$exp"), got $(printf %q "$got"))"
+unset ${!test_*}
+
+# ======
 r=readonly u=Uppercase l=Lowercase i=22 i8=10 L=abc L5=def uL5=abcdef xi=20
 x=export t=tagged H=hostname LZ5=026 RZ5=026 Z5=123 lR5=ABcdef R5=def n=l
 for option in u l i i8 L L5 LZ5 RZ5 Z5 r x H t R5 uL5 lR5 xi n