diff --git a/src/pl/plperl/GNUmakefile b/src/pl/plperl/GNUmakefile
index 188d7d2..8ab90a6 100644
--- a/src/pl/plperl/GNUmakefile
+++ b/src/pl/plperl/GNUmakefile
@@ -44,7 +44,9 @@ PERLCHUNKS = plc_perlboot.pl plc_trusted.pl
 SHLIB_LINK = $(perl_embed_ldflags)
 
 REGRESS_OPTS = --dbname=$(PL_TESTDB) --load-extension=plperl  --load-extension=plperlu
-REGRESS = plperl plperl_trigger plperl_shared plperl_elog plperl_util plperl_init plperlu plperl_array
+REGRESS_LC0 = $(subst .sql,,$(shell cd sql; ls plperl_lc_$(shell echo $(ENCODING) | tr "A-Z-" "a-z_").sql 2>/dev/null))
+REGRESS_LC = $(if $(REGRESS_LC0),$(REGRESS_LC0),plperl_lc)
+REGRESS = plperl $(REGRESS_LC) plperl_trigger plperl_shared plperl_elog plperl_util plperl_init plperlu plperl_array
 # if Perl can support two interpreters in one backend,
 # test plperl-and-plperlu cases
 ifneq ($(PERL),)
diff --git a/src/pl/plperl/expected/plperl.out b/src/pl/plperl/expected/plperl.out
index df54937..906dc15 100644
--- a/src/pl/plperl/expected/plperl.out
+++ b/src/pl/plperl/expected/plperl.out
@@ -650,16 +650,6 @@ CONTEXT:  PL/Perl anonymous code block
 DO $do$ use warnings FATAL => qw(void) ; my @y; my $x = sort @y; 1; $do$ LANGUAGE plperl;
 ERROR:  Useless use of sort in scalar context at line 1.
 CONTEXT:  PL/Perl anonymous code block
---
--- Make sure strings are validated
--- Should fail for all encodings, as nul bytes are never permitted.
---
-CREATE OR REPLACE FUNCTION perl_zerob() RETURNS TEXT AS $$
-  return "abcd\0efg";
-$$ LANGUAGE plperl;
-SELECT perl_zerob();
-ERROR:  invalid byte sequence for encoding "UTF8": 0x00
-CONTEXT:  PL/Perl function "perl_zerob"
 -- make sure functions marked as VOID without an explicit return work
 CREATE OR REPLACE FUNCTION myfuncs() RETURNS void AS $$
    $_SHARED{myquote} = sub {
diff --git a/src/pl/plperl/expected/plperl_lc.out b/src/pl/plperl/expected/plperl_lc.out
new file mode 100644
index 0000000..4f8c08f
--- /dev/null
+++ b/src/pl/plperl/expected/plperl_lc.out
@@ -0,0 +1,10 @@
+--
+-- Make sure strings are validated
+-- Should fail for all encodings, as nul bytes are never permitted.
+--
+CREATE OR REPLACE FUNCTION perl_zerob() RETURNS TEXT AS $$
+  return "abcd\0efg";
+$$ LANGUAGE plperl;
+SELECT perl_zerob();
+ERROR:  invalid byte sequence for encoding "UTF8": 0x00
+CONTEXT:  PL/Perl function "perl_zerob"
diff --git a/src/pl/plperl/expected/plperl_lc_sql_ascii.out b/src/pl/plperl/expected/plperl_lc_sql_ascii.out
new file mode 100644
index 0000000..022c3e2
--- /dev/null
+++ b/src/pl/plperl/expected/plperl_lc_sql_ascii.out
@@ -0,0 +1,10 @@
+--
+-- Make sure strings are validated
+-- Should fail for all encodings, as nul bytes are never permitted.
+--
+CREATE OR REPLACE FUNCTION perl_zerob() RETURNS TEXT AS $$
+  return "abcd\0efg";
+$$ LANGUAGE plperl;
+SELECT perl_zerob();
+ERROR:  invalid byte sequence for encoding "SQL_ASCII": 0x00
+CONTEXT:  PL/Perl function "perl_zerob"
diff --git a/src/pl/plperl/sql/plperl.sql b/src/pl/plperl/sql/plperl.sql
index 84af1fd..a5e3840 100644
--- a/src/pl/plperl/sql/plperl.sql
+++ b/src/pl/plperl/sql/plperl.sql
@@ -423,15 +423,6 @@ DO $do$ use strict; my $name = "foo"; my $ref = $$name; $do$ LANGUAGE plperl;
 -- yields "ERROR:  Useless use of sort in scalar context."
 DO $do$ use warnings FATAL => qw(void) ; my @y; my $x = sort @y; 1; $do$ LANGUAGE plperl;
 
---
--- Make sure strings are validated
--- Should fail for all encodings, as nul bytes are never permitted.
---
-CREATE OR REPLACE FUNCTION perl_zerob() RETURNS TEXT AS $$
-  return "abcd\0efg";
-$$ LANGUAGE plperl;
-SELECT perl_zerob();
-
 -- make sure functions marked as VOID without an explicit return work
 CREATE OR REPLACE FUNCTION myfuncs() RETURNS void AS $$
    $_SHARED{myquote} = sub {
diff --git a/src/pl/plperl/sql/plperl_lc.sql b/src/pl/plperl/sql/plperl_lc.sql
new file mode 100644
index 0000000..a4a06e7
--- /dev/null
+++ b/src/pl/plperl/sql/plperl_lc.sql
@@ -0,0 +1,8 @@
+--
+-- Make sure strings are validated
+-- Should fail for all encodings, as nul bytes are never permitted.
+--
+CREATE OR REPLACE FUNCTION perl_zerob() RETURNS TEXT AS $$
+  return "abcd\0efg";
+$$ LANGUAGE plperl;
+SELECT perl_zerob();
diff --git a/src/pl/plperl/sql/plperl_lc_sql_ascii.sql b/src/pl/plperl/sql/plperl_lc_sql_ascii.sql
new file mode 120000
index 0000000..9da97db
--- /dev/null
+++ b/src/pl/plperl/sql/plperl_lc_sql_ascii.sql
@@ -0,0 +1 @@
+plperl_lc.sql
\ No newline at end of file