diff --git a/lib/log4js.js b/lib/log4js.js
index b0bfab4..5ad5625 100644
--- a/lib/log4js.js
+++ b/lib/log4js.js
@@ -257,6 +257,7 @@ function loadAppender(appender) {
         debug("Appender ", appender, " is not a core log4js appender.");
         appenderModule = require(appender);
       } catch (err) {
+        debug("Error loading appender %s: ", appender, err);
         throw new Error("Could not load appender of type '" + appender + "'.");
       }
     }