diff --git a/src/main/java/com/jcabi/jdbc/PrepareArgs.java b/src/main/java/com/jcabi/jdbc/PrepareArgs.java
index 99138cd..1660762 100644
--- a/src/main/java/com/jcabi/jdbc/PrepareArgs.java
+++ b/src/main/java/com/jcabi/jdbc/PrepareArgs.java
@@ -85,7 +85,7 @@ public void prepare(final PreparedStatement stmt) throws SQLException {
             } else if (arg instanceof byte[]) {
                 stmt.setBytes(pos, byte[].class.cast(arg));
             } else {
-                stmt.setString(pos, arg.toString());
+                stmt.setObject(pos, arg);
             }
             ++pos;
         }