diff --git a/src/crankshaft/s390/lithium-codegen-s390.h b/src/crankshaft/s390/lithium-codegen-s390.h
index 7721b30..6abd4fa 100644
--- a/src/crankshaft/s390/lithium-codegen-s390.h
+++ b/src/crankshaft/s390/lithium-codegen-s390.h
@@ -116,7 +116,8 @@
   MemOperand PrepareKeyedOperand(Register key, Register base,
                                  bool key_is_constant, bool key_is_tagged,
                                  int constant_key, int element_size_shift,
-                                 int base_offset);
+                                 int base_offset,
+                                 bool keyMaybeNegative = true);
 
   // Emit frame translation commands for an environment.
   void WriteTranslation(LEnvironment* environment, Translation* translation);