diff --git a/vm/os-unix.hpp b/vm/os-unix.hpp
index fa9bc71417..bb784bc93c 100644
--- a/vm/os-unix.hpp
+++ b/vm/os-unix.hpp
@@ -26,18 +26,8 @@ typedef char symbol_char;
 #define FTELL ftello
 #define FSEEK fseeko
 
-#define FIXNUM_FORMAT "%ld"
-#define CELL_FORMAT "%lu"
 #define CELL_HEX_FORMAT "%lx"
 
-#ifdef FACTOR_64
-	#define CELL_HEX_PAD_FORMAT "%016lx"
-#else
-	#define CELL_HEX_PAD_FORMAT "%08lx"
-#endif
-
-#define FIXNUM_FORMAT "%ld"
-
 #define OPEN_READ(path) fopen(path,"rb")
 #define OPEN_WRITE(path) fopen(path,"wb")
 
diff --git a/vm/os-windows.hpp b/vm/os-windows.hpp
index eeac2a42dd..a7c69571d9 100644
--- a/vm/os-windows.hpp
+++ b/vm/os-windows.hpp
@@ -23,15 +23,9 @@ typedef wchar_t vm_char;
 #define FSEEK fseeko64
 
 #ifdef WIN64
-	#define CELL_FORMAT "%Iu"
 	#define CELL_HEX_FORMAT "%Ix"
-	#define CELL_HEX_PAD_FORMAT "%016Ix"
-	#define FIXNUM_FORMAT "%Id"
 #else
-	#define CELL_FORMAT "%lu"
 	#define CELL_HEX_FORMAT "%lx"
-	#define CELL_HEX_PAD_FORMAT "%08lx"
-	#define FIXNUM_FORMAT "%ld"
 #endif
 
 #define OPEN_READ(path) _wfopen(path,L"rb")