diff --git a/DataSpec/DNACommon/PAK.hpp b/DataSpec/DNACommon/PAK.hpp
index 39d1a6c5e..f4ef94012 100644
--- a/DataSpec/DNACommon/PAK.hpp
+++ b/DataSpec/DNACommon/PAK.hpp
@@ -18,12 +18,12 @@ namespace DataSpec {
 /** PAK entry stream reader */
 class PAKEntryReadStream : public athena::io::IStreamReader {
   std::unique_ptr<atUint8[]> m_buf;
-  atUint64 m_sz;
-  atUint64 m_pos;
+  atUint64 m_sz = 0;
+  atUint64 m_pos = 0;
 
 public:
-  PAKEntryReadStream() {}
-  operator bool() const { return m_buf.operator bool(); }
+  PAKEntryReadStream() = default;
+  explicit operator bool() const { return m_buf.operator bool(); }
   PAKEntryReadStream(const PAKEntryReadStream& other) = delete;
   PAKEntryReadStream(PAKEntryReadStream&& other) = default;
   PAKEntryReadStream& operator=(const PAKEntryReadStream& other) = delete;