diff --git a/compiler/optimizing/code_generator_x86.h b/compiler/optimizing/code_generator_x86.h
index ffcaf60..23145bf 100644
--- a/compiler/optimizing/code_generator_x86.h
+++ b/compiler/optimizing/code_generator_x86.h
@@ -119,6 +119,11 @@
   X86Assembler* GetAssembler() const { return assembler_; }
 
  private:
+  // Generate code for the given suspend check. If not null, `successor`
+  // is the block to branch to if the suspend check is not needed, and after
+  // the suspend call.
+  void GenerateSuspendCheck(HSuspendCheck* check, HBasicBlock* successor);
+
   X86Assembler* const assembler_;
   CodeGeneratorX86* const codegen_;