diff --git a/src/lithium.h b/src/lithium.h
index d85a87c..280da47 100644
--- a/src/lithium.h
+++ b/src/lithium.h
@@ -143,7 +143,8 @@
   };
 
   static const int kMaxVirtualRegisters = 1 << (kVirtualRegisterWidth + 1);
-  static const int kMaxFixedIndices = 128;
+  static const int kMaxFixedIndex = 63;
+  static const int kMinFixedIndex = -64;
 
   bool HasIgnorePolicy() const { return policy() == IGNORE; }
   bool HasNoPolicy() const { return policy() == NONE; }