diff --git a/setup.py b/setup.py
index 4828fd81..78d120be 100644
--- a/setup.py
+++ b/setup.py
@@ -66,7 +66,7 @@ def detect_openssl(prefixes):
                     return prefix
 
 
-possible_openssl_prefixes = ['/usr', '/usr/local', '/usr/local/opt/openssl', '/usr/local/ssl', '/usr/local/openssl', '/usr/local/attic', '/opt/local']
+possible_openssl_prefixes = ['/usr', '/usr/local', '/usr/local/opt/openssl', '/usr/local/ssl', '/usr/local/openssl', '/usr/local/attic', '/opt/local', '/opt/pkg']
 if os.environ.get('ATTIC_OPENSSL_PREFIX'):
     possible_openssl_prefixes.insert(0, os.environ.get('ATTIC_OPENSSL_PREFIX'))
 ssl_prefix = detect_openssl(possible_openssl_prefixes)