diff --git a/file/include/logbook/logbook.hpp b/file/include/logbook/logbook.hpp
index cb4d856..9c2eb09 100644
--- a/file/include/logbook/logbook.hpp
+++ b/file/include/logbook/logbook.hpp
@@ -99,9 +99,8 @@ namespace file
         {
           std::ifstream in(BASE_DIRECTORY LOGBOOK, std::ifstream::binary);
 
-          // File Header
           std::string ident = readString(in, 5);
-          if (ident.compare("VGAL") != 0) {
+          if (ident.compare(LOGBOOK_HEADER) != 0) {
             throw std::invalid_argument("Wrong file");
           }
           std::uint8_t version = read<std::uint8_t>(in);
@@ -129,8 +128,8 @@ namespace file
         inline void toFile() const
         {
           std::ofstream out(BASE_DIRECTORY LOGBOOK, std::fstream::binary);
-          char header[] = {'V', 'G', 'A', 'L', '\0', 1};
-          out.write(header, 6);
+          out.write(LOGBOOK_HEADER, 4);
+          out.write("\1", 1);
           for (const LogbookEntry &entry : this->entries) {
             entry.toFile(out);
           }
diff --git a/file/include/recording/recording.hpp b/file/include/recording/recording.hpp
index 37b0a60..33f8277 100644
--- a/file/include/recording/recording.hpp
+++ b/file/include/recording/recording.hpp
@@ -41,8 +41,8 @@ namespace file
         {
           std::ofstream out(BASE_DIRECTORY RECORDING_DIRECTORY + fileName,
                             std::fstream::binary);
-          char header[] = {'V', 'G', 'A', 'R', '\0', 1};
-          out.write(header, 6);
+          out.write(RECORDING_HEADER, 4);
+          out.write("\1", 1);
           for (const RecordingEntry &entry : this->entries) {
             entry.toFile(out);
           }
diff --git a/file/include/simdata/simDatabase.hpp b/file/include/simdata/simDatabase.hpp
index 75a28bc..b43d642 100644
--- a/file/include/simdata/simDatabase.hpp
+++ b/file/include/simdata/simDatabase.hpp
@@ -88,9 +88,8 @@ namespace file
         {
           std::ifstream in(BASE_DIRECTORY SIMDATABASE, std::ifstream::binary);
 
-          // File Header
           std::string ident = readString(in, 5);
-          if (ident.compare("VGAS") != 0) {
+          if (ident.compare(SIMDATABASE_HEADER) != 0) {
             throw std::invalid_argument("Wrong file");
           }
           std::uint8_t version = read<std::uint8_t>(in);
@@ -133,9 +132,9 @@ namespace file
         {
           std::ofstream out(BASE_DIRECTORY SIMDATABASE, std::fstream::binary);
 
-          // File Header, Last member is version
-          std::uint8_t header[] = {'V', 'G', 'A', 'S', '\0', 1};
-          out.write(reinterpret_cast<const char *>(header), 6);
+          // File Header
+          out.write(SIMDATABASE_HEADER, 4);
+          out.write("\1", 1);
           // Num Airports
           write<std::uint16_t>(out, airports.size());
           // Airport
diff --git a/file/php/Recording.php b/file/php/Recording.php
index 5614ebd..3b95f44 100644
--- a/file/php/Recording.php
+++ b/file/php/Recording.php
@@ -5,7 +5,7 @@ namespace germanairlinesva_recording;
 class Recording
 {
   private const ident = "VGAR";
-  private const header_unpack = "Z5ident/Cversion";
+  private const header_unpack = "a4ident/Cversion";
   private const segment_unpack = "Vtime/Saltitude/Sgroundspeed/elatitude/elongitude";
 
   private string $file_name;
@@ -122,7 +122,7 @@ class Recording
       throw new \InvalidArgumentException(sprintf('Argument must be a valid resource type. %s given.', gettype($file)));
     }
 
-    $header = unpack(Recording::header_unpack, fread($file, 6));
+    $header = unpack(Recording::header_unpack, fread($file, 5));
 
     if ($header["ident"] !== Recording::ident) {
       throw
diff --git a/utilities/include/constants.h b/utilities/include/constants.h
index 8c0f777..66609bf 100644
--- a/utilities/include/constants.h
+++ b/utilities/include/constants.h
@@ -19,4 +19,8 @@
 #define SIMDATABASE "sim.bin"
 #define LOGBOOK "logbook.bin"
 
+#define LOGBOOK_HEADER "VGAL"
+#define RECORDING_HEADER "VGAR"
+#define SIMDATABASE_HEADER "VGAS"
+
 #endif
\ No newline at end of file