diff --git a/csjavacc/parser/RStringLiteral.java b/csjavacc/parser/RStringLiteral.java
index f7f9f34..3b1cfca 100644
--- a/csjavacc/parser/RStringLiteral.java
+++ b/csjavacc/parser/RStringLiteral.java
@@ -1178,8 +1178,8 @@ public class RStringLiteral extends RegularExpression {
 
               condGenerated = true;
 
-              ostr.print("(active" + j + " & 0x" +
-                          Long.toHexString(actives[j]) + "L) != 0L");
+              ostr.print("(active" + j + " & unchecked((long)0x" +
+                          Long.toHexString(actives[j]) + "L)) != 0L");
            }
 
            if (condGenerated)