diff --git a/Source/Core/Core/Boot/DolReader.h b/Source/Core/Core/Boot/DolReader.h
index 43b1c0f354..e2daa04733 100644
--- a/Source/Core/Core/Boot/DolReader.h
+++ b/Source/Core/Core/Boot/DolReader.h
@@ -13,8 +13,8 @@
 class DolReader final : public BootExecutableReader
 {
 public:
-  DolReader(const std::string& filename);
-  DolReader(const std::vector<u8>& buffer);
+  explicit DolReader(const std::string& filename);
+  explicit DolReader(const std::vector<u8>& buffer);
   ~DolReader();
 
   bool IsValid() const override { return m_is_valid; }