diff --git a/lib/hx509/test_pkcs11.in b/lib/hx509/test_pkcs11.in
index 45145fe6c..6c9dba726 100644
--- a/lib/hx509/test_pkcs11.in
+++ b/lib/hx509/test_pkcs11.in
@@ -37,6 +37,7 @@ objdir="@objdir@"
 
 cat > test-rc-file.rc <<EOF
 certificate	cert	User certificate	FILE:$srcdir/data/test.crt,$srcdir/data/test.key
+debug	p11dbg.log
 EOF
 
 env SOFTPKCS11RC="test-rc-file.rc" \