diff --git a/library/x509_crt.c b/library/x509_crt.c
index acda1f2..2334a35 100644
--- a/library/x509_crt.c
+++ b/library/x509_crt.c
@@ -929,6 +929,7 @@
 
     if( crt->sig_oid.len != sig_oid2.len ||
         memcmp( crt->sig_oid.p, sig_oid2.p, crt->sig_oid.len ) != 0 ||
+        sig_params1.tag != sig_params2.tag ||
         sig_params1.len != sig_params2.len ||
         ( sig_params1.len != 0 &&
           memcmp( sig_params1.p, sig_params2.p, sig_params1.len ) != 0 ) )