diff --git a/runtime/dex_file.h b/runtime/dex_file.h
index 250795b..cb7f174 100644
--- a/runtime/dex_file.h
+++ b/runtime/dex_file.h
@@ -1197,6 +1197,9 @@
     return Signature();
   }
 
+  bool IsVoid() const;
+  uint32_t GetNumberOfParameters() const;
+
   bool operator==(const Signature& rhs) const;
   bool operator!=(const Signature& rhs) const {
     return !(*this == rhs);