diff --git a/doxygen.cfg b/doxygen.cfg
index 3f81c3a..2a8fa52 100644
--- a/doxygen.cfg
+++ b/doxygen.cfg
@@ -38,7 +38,7 @@ PROJECT_NAME           = TTMath
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = 0.9.4
+PROJECT_NUMBER         = 0.9.4_prerelease_2019-07-31
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer a
diff --git a/ttmath/ttmathtypes.h b/ttmath/ttmathtypes.h
index 2b2092c..2253a6a 100644
--- a/ttmath/ttmathtypes.h
+++ b/ttmath/ttmathtypes.h
@@ -5,7 +5,7 @@
  */
 
 /* 
- * Copyright (c) 2006-2017, Tomasz Sowa
+ * Copyright (c) 2006-2019, Tomasz Sowa
  * All rights reserved.
  * 
  * Redistribution and use in source and binary forms, with or without
@@ -235,12 +235,12 @@ namespace ttmath
 		/*!
 			on 64bit platforms one word (uint, sint) will be equal 64bits
 		*/
-		typedef unsigned long uint;
+		typedef uint64_t uint;
 
 		/*!
 			on 64bit platforms one word (uint, sint) will be equal 64bits
 		*/
-		typedef signed   long sint;
+		typedef int64_t sint;
 	#endif 
 
 	/*!