diff --git a/certificate.cpp b/certificate.cpp
index 7872d81..4e6defc 100644
--- a/certificate.cpp
+++ b/certificate.cpp
@@ -41,6 +41,7 @@
     ((errnum == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT) ||                     \
      (errnum == X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN) ||                       \
      (errnum == X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY) ||               \
+     (errnum == X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT) ||                       \
      (errnum == X509_V_ERR_CERT_UNTRUSTED) ||                                  \
      (errnum == X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE))