diff --git perl-5.40.3/ext/re/Makefile.PL perl-5.40.3/ext/re/Makefile.PL
index 01786e1ec2..cc4619bfc3 100644
--- perl-5.40.3/ext/re/Makefile.PL
+++ perl-5.40.3/ext/re/Makefile.PL
@@ -27,7 +27,7 @@ foreach my $tuple (@files) {
     }
 }
 
-my $defines = '-DPERL_EXT_RE_BUILD -DPERL_EXT_RE_DEBUG -DPERL_EXT';
+my $defines = '-DPERL_EXT_RE_BUILD -DPERL_EXT_RE_DEBUG -DPERL_EXT -DDEBUGGING';
 my %args;
 for my $arg (@ARGV) {
     $args{$1} = $2 if $arg =~ /^(\w+)=(.*)$/;