diff --git a/lib/plsql/oci_connection.rb b/lib/plsql/oci_connection.rb
index 147a12a..caf783e 100644
--- a/lib/plsql/oci_connection.rb
+++ b/lib/plsql/oci_connection.rb
@@ -289,7 +289,11 @@ def raw_oci_connection
         # ActiveRecord Oracle enhanced adapter puts OCI8EnhancedAutoRecover wrapper around OCI8
         # in this case we need to pass original OCI8 connection
         else
-          raw_connection.instance_variable_get(:@connection)
+          if raw_connection.instance_variable_defined?(:@raw_connection)
+            raw_connection.instance_variable_get(:@raw_connection)
+          else
+            raw_connection.instance_variable_get(:@connection)
+          end
         end
       end