diff -r 0206df35882c -r c58dff4e560c jitcraft/BytecodeCompiler.cpp
--- a/jitcraft/BytecodeCompiler.cpp	Tue Jul 17 21:40:44 2012 -0700
+++ b/jitcraft/BytecodeCompiler.cpp	Tue Jul 17 23:05:38 2012 -0700
@@ -408,6 +408,18 @@
 BytecodeCompiler::visit(UnaryExpression *node)
 {
     switch (node->token()) {
+      case TOK_MINUS:
+      {
+        Local<Type> type(zone_, node->expression()->type());
+        node->expression()->accept(this);
+        
+        if (node->type()->isFloat())
+            __ neg_f();
+        else
+            __ neg();
+        break;
+      }
+
       case TOK_NOT:
       {
         Local<Type> type(zone_, node->expression()->type());