diff --git a/meta/classes/cpan-base.bbclass b/meta/classes/cpan-base.bbclass
index 7e1e8d0d6b..aa502d5faa 100644
--- a/meta/classes/cpan-base.bbclass
+++ b/meta/classes/cpan-base.bbclass
@@ -10,6 +10,9 @@ RDEPENDS_${PN} += "${@["perl", ""][(bb.data.inherits_class('native', d))]}"
 PERL_OWN_DIR = "${@["", "/perl-native"][(bb.data.inherits_class('native', d))]}"
 
 # Determine the staged version of perl from the perl configuration file
+# Assign vardepvalue, because otherwise signature is changed before and after
+# perl is built (from None to real version in config.sh).
+get_perl_version[vardepvalue] = "${PERL_OWN_DIR}"
 def get_perl_version(d):
     import re
     cfg = d.expand('${STAGING_LIBDIR}${PERL_OWN_DIR}/perl/config.sh')