diff --git a/setuptools/ssl_support.py b/setuptools/ssl_support.py
index f4ba8a9..1627263 100644
--- a/setuptools/ssl_support.py
+++ b/setuptools/ssl_support.py
@@ -26,6 +26,7 @@ cert_paths = """
 /etc/ssl/cert.pem
 /System/Library/OpenSSL/certs/cert.pem
 /usr/local/share/certs/ca-root-nss.crt
+/etc/ssl/ca-bundle.pem
 """.strip().split()
 
 
@@ -242,6 +243,7 @@ def find_ca_bundle():
             if os.path.isfile(cert_path):
                 return cert_path
     try:
-        return pkg_resources.resource_filename('certifi', 'cacert.pem')
+        import certifi
+        return certifi.where()
     except (ImportError, ResolutionError, ExtractionError):
         return None