diff --git a/src/packer.cpp b/src/packer.cpp
index 66558416..eff5fe9f 100644
--- a/src/packer.cpp
+++ b/src/packer.cpp
@@ -556,7 +556,6 @@ unsigned Packer::getRandomId() const
 void Packer::initPackHeader()
 {
     memset(&ph, 0, sizeof(ph));
-    ph.magic = UPX_MAGIC_LE32;                    // "UPX!"
     ph.version = getVersion();
     ph.format = getFormat();
     ph.method = -1;
diff --git a/src/packer.h b/src/packer.h
index d8b94e58..2a406b8f 100644
--- a/src/packer.h
+++ b/src/packer.h
@@ -61,7 +61,7 @@ public:
 
 public:
     // fields stored in compressed file
-    unsigned magic;             // UPX_MAGIC_LE32
+    enum { magic = UPX_MAGIC_LE32 };
     int version;
     int format;                 // executable format
     int method;                 // compresison method