diff --git a/nss/lib/ckfw/builtins/Makefile b/nss/lib/ckfw/builtins/Makefile
index 2a633d2..561818b 100644
--- a/nss/lib/ckfw/builtins/Makefile
+++ b/nss/lib/ckfw/builtins/Makefile
@@ -67,4 +67,4 @@ NSS_CERTDATA_TXT = certdata.txt
 endif
 
 $(OBJDIR)/certdata.c: $(NSS_CERTDATA_TXT) certdata.perl | $$(@D)/d
-	$(PERL) certdata.perl $(NSS_CERTDATA_TXT) $@
+	./certdata.sh $(NSS_CERTDATA_TXT) $@
diff --git a/nss/lib/ckfw/builtins/testlib/Makefile b/nss/lib/ckfw/builtins/testlib/Makefile
index 9eb29dd..d170325 100644
--- a/nss/lib/ckfw/builtins/testlib/Makefile
+++ b/nss/lib/ckfw/builtins/testlib/Makefile
@@ -71,5 +71,5 @@ NSS_CERTDATA-TESTLIB_TXT = certdata-testlib.txt
 endif
 
 $(OBJDIR)/certdata-testlib.c: $(NSS_CERTDATA-TESTLIB_TXT) | $$(@D)/d
-	$(PERL) ../certdata.perl $(NSS_CERTDATA-TESTLIB_TXT) $@
+	../certdata.sh $(NSS_CERTDATA-TESTLIB_TXT) $@