diff --git a/org/postgresql/ds/common/BaseDataSource.java b/org/postgresql/ds/common/BaseDataSource.java
index bfe54f7..a6726f9 100644
--- a/org/postgresql/ds/common/BaseDataSource.java
+++ b/org/postgresql/ds/common/BaseDataSource.java
@@ -486,7 +486,9 @@
         sb.append("&socketTimeout=").append(socketTimeout);
         sb.append("&prepareThreshold=").append(prepareThreshold);
         sb.append("&unknownLength=").append(unknownLength);
-        sb.append("&loglevel=").append(logLevel);
+        if (logLevel != 0) {
+            sb.append("&loglevel=").append(logLevel);
+        }
         if (protocolVersion != 0) {
             sb.append("&protocolVersion=").append(protocolVersion);
         }