diff --git a/code/FBXBinaryTokenizer.cpp b/code/FBXBinaryTokenizer.cpp
index 7138df431..a4a2bc8e7 100644
--- a/code/FBXBinaryTokenizer.cpp
+++ b/code/FBXBinaryTokenizer.cpp
@@ -98,7 +98,7 @@ namespace FBX {
 //	return (flags & to_check) != 0;
 //}
 // ------------------------------------------------------------------------------------------------
-Token::Token(const char* sbegin, const char* send, TokenType type, unsigned int offset)
+Token::Token(const char* sbegin, const char* send, TokenType type, size_t offset)
     :
     #ifdef DEBUG
     contents(sbegin, static_cast<size_t>(send-sbegin)),
@@ -122,18 +122,18 @@ namespace {
 
 // ------------------------------------------------------------------------------------------------
 // signal tokenization error, this is always unrecoverable. Throws DeadlyImportError.
-AI_WONT_RETURN void TokenizeError(const std::string& message, unsigned int offset) AI_WONT_RETURN_SUFFIX;
-AI_WONT_RETURN void TokenizeError(const std::string& message, unsigned int offset)
+AI_WONT_RETURN void TokenizeError(const std::string& message, size_t offset) AI_WONT_RETURN_SUFFIX;
+AI_WONT_RETURN void TokenizeError(const std::string& message, size_t offset)
 {
     throw DeadlyImportError(Util::AddOffset("FBX-Tokenize",message,offset));
 }
 
 
 // ------------------------------------------------------------------------------------------------
-uint32_t Offset(const char* begin, const char* cursor) {
+size_t Offset(const char* begin, const char* cursor) {
     ai_assert(begin <= cursor);
 
-    return static_cast<unsigned int>(cursor - begin);
+    return cursor - begin;
 }
 
 // ------------------------------------------------------------------------------------------------
@@ -424,7 +424,7 @@ bool ReadScope(TokenList& output_tokens, const char* input, const char*& cursor,
 
 // ------------------------------------------------------------------------------------------------
 // TODO: Test FBX Binary files newer than the 7500 version to check if the 64 bits address behaviour is consistent
-void TokenizeBinary(TokenList& output_tokens, const char* input, unsigned int length)
+void TokenizeBinary(TokenList& output_tokens, const char* input, size_t length)
 {
     ai_assert(input);
 
diff --git a/code/FBXImporter.cpp b/code/FBXImporter.cpp
index 988735a77..ec8bbd2b4 100644
--- a/code/FBXImporter.cpp
+++ b/code/FBXImporter.cpp
@@ -172,7 +172,7 @@ void FBXImporter::InternReadFile( const std::string& pFile, aiScene* pScene, IOS
         bool is_binary = false;
         if (!strncmp(begin,"Kaydara FBX Binary",18)) {
             is_binary = true;
-            TokenizeBinary(tokens,begin,static_cast<unsigned int>(contents.size()));
+            TokenizeBinary(tokens,begin,contents.size());
         }
         else {
             Tokenize(tokens,begin);
diff --git a/code/FBXTokenizer.h b/code/FBXTokenizer.h
index 2af29743f..afa588a47 100644
--- a/code/FBXTokenizer.h
+++ b/code/FBXTokenizer.h
@@ -93,7 +93,7 @@ public:
     Token(const char* sbegin, const char* send, TokenType type, unsigned int line, unsigned int column);
 
     /** construct a binary token */
-    Token(const char* sbegin, const char* send, TokenType type, unsigned int offset);
+    Token(const char* sbegin, const char* send, TokenType type, size_t offset);
 
     ~Token();
 
@@ -118,14 +118,14 @@ public:
         return type;
     }
 
-    unsigned int Offset() const {
+    size_t Offset() const {
         ai_assert(IsBinary());
         return offset;
     }
 
     unsigned int Line() const {
         ai_assert(!IsBinary());
-        return line;
+        return static_cast<unsigned int>(line);
     }
 
     unsigned int Column() const {
@@ -147,8 +147,8 @@ private:
     const TokenType type;
 
     union {
-        const unsigned int line;
-        unsigned int offset;
+        size_t line;
+        size_t offset;
     };
     const unsigned int column;
 };
@@ -178,7 +178,7 @@ void Tokenize(TokenList& output_tokens, const char* input);
  * @param input_buffer Binary input buffer to be processed.
  * @param length Length of input buffer, in bytes. There is no 0-terminal.
  * @throw DeadlyImportError if something goes wrong */
-void TokenizeBinary(TokenList& output_tokens, const char* input, unsigned int length);
+void TokenizeBinary(TokenList& output_tokens, const char* input, size_t length);
 
 
 } // ! FBX
diff --git a/code/FBXUtil.cpp b/code/FBXUtil.cpp
index 0c73ba9f9..c10e057c8 100644
--- a/code/FBXUtil.cpp
+++ b/code/FBXUtil.cpp
@@ -86,7 +86,7 @@ const char* TokenTypeString(TokenType t)
 
 
 // ------------------------------------------------------------------------------------------------
-std::string AddOffset(const std::string& prefix, const std::string& text, unsigned int offset)
+std::string AddOffset(const std::string& prefix, const std::string& text, size_t offset)
 {
     return static_cast<std::string>( (Formatter::format() << prefix << " (offset 0x" << std::hex << offset << ") " << text) );
 }
diff --git a/code/FBXUtil.h b/code/FBXUtil.h
index f7e148c2e..b63441885 100644
--- a/code/FBXUtil.h
+++ b/code/FBXUtil.h
@@ -78,7 +78,7 @@ const char* TokenTypeString(TokenType t);
  *  @param line Line index, 1-based
  *  @param column Column index, 1-based
  *  @return A string of the following format: {prefix} (offset 0x{offset}) {text}*/
-std::string AddOffset(const std::string& prefix, const std::string& text, unsigned int offset);
+std::string AddOffset(const std::string& prefix, const std::string& text, size_t offset);
 
 
 /** Format log/error messages using a given line location in the source file.