diff -r 77c318a4badd -r f99bc938522a jitcraft/Scanner.cpp
--- a/jitcraft/Scanner.cpp	Tue Jul 17 23:10:54 2012 -0700
+++ b/jitcraft/Scanner.cpp	Wed Jul 18 21:46:29 2012 -0700
@@ -469,6 +469,13 @@
             putChar(c);
             return TOK_BITXOR;
 
+          case '%':
+            c = getChar();
+            if (c == '=')
+                return TOK_ASSIGN_MOD;
+            putChar(c);
+            return TOK_PERCENT;
+
           case '-':
             c = getChar();
             if (c == '=')