diff --git a/src/windows-emulator/emulator_utils.hpp b/src/windows-emulator/emulator_utils.hpp
index fdab413b..61114451 100644
--- a/src/windows-emulator/emulator_utils.hpp
+++ b/src/windows-emulator/emulator_utils.hpp
@@ -84,7 +84,7 @@ class emulator_object
         return reinterpret_cast<T*>(this->address_);
     }
 
-    operator bool() const
+    explicit operator bool() const
     {
         return this->address_ != 0;
     }