2 files changed, 21 insertions, 22 deletions
diff --git a/win32/win32.c b/win32/win32.c
index 5ec3aea4a..530cada51 100644
--- a/win32/win32.c
+++ b/win32/win32.c
@@ -47,12 +47,6 @@
 #define bool int
 #endif
 
-#ifdef _M_IX86
-# define WIN95 1
-#else
-# undef  WIN95
-#endif
-
 #if defined __BORLANDC__ || defined _WIN32_WCE
 #  define _filbuf _fgetc
 #  define _flsbuf _fputc
@@ -209,10 +203,10 @@ map_errno(DWORD winerr)
 static char *NTLoginName;
 
 #ifdef WIN95
-DWORD Win32System = (DWORD)-1;
+static DWORD Win32System = (DWORD)-1;
 
-static DWORD
-IdOS(void)
+DWORD
+rb_w32_osid(void)
 {
     static OSVERSIONINFO osver;
 
@@ -224,21 +218,11 @@ IdOS(void)
     }
     return (Win32System);
 }
-
-static int 
-IsWin95(void) {
-    return (IdOS() == VER_PLATFORM_WIN32_WINDOWS);
-}
-
-static int
-IsWinNT(void) {
-    return (IdOS() == VER_PLATFORM_WIN32_NT);
-}
-#else
-# define IsWinNT() TRUE
-# define IsWin95() FALSE
 #endif
 
+#define IsWinNT() rb_w32_iswinnt()
+#define IsWin95() rb_w32_iswin95()
+
 /* main thread constants */
 static struct {
     HANDLE handle;
diff --git a/win32/win32.h b/win32/win32.h
index 5a93f2d31..2d88de472 100644
--- a/win32/win32.h
+++ b/win32/win32.h
@@ -74,6 +74,21 @@ extern "C++" {
 }
 #endif
 
+#ifdef _M_IX86
+# define WIN95 1
+#else
+# undef  WIN95
+#endif
+
+#ifdef WIN95
+extern DWORD rb_w32_osid(void);
+#define rb_w32_iswinnt()  (rb_w32_osid() == VER_PLATFORM_WIN32_NT)
+#define rb_w32_iswin95()  (rb_w32_osid() == VER_PLATFORM_WIN32_WINDOWS)
+#else
+#define rb_w32_iswinnt()  TRUE
+#define rb_w32_iswin95()  FALSE
+#endif
+
 #define WNOHANG -1
 
 #undef getc