diff --git a/src/hotspot/cpu/x86/macroAssembler_x86.hpp b/src/hotspot/cpu/x86/macroAssembler_x86.hpp
index 433f1ca..a48c9ac 100644
--- a/src/hotspot/cpu/x86/macroAssembler_x86.hpp
+++ b/src/hotspot/cpu/x86/macroAssembler_x86.hpp
@@ -96,6 +96,7 @@ class MacroAssembler: public Assembler {
 
   void null_check(Register reg, int offset = -1);
   static bool needs_explicit_null_check(intptr_t offset);
+  static bool uses_implicit_null_check(void* address);
 
   // Required platform-specific helpers for Label::patch_instructions.
   // They _shadow_ the declarations in AbstractAssembler, which are undefined.