diff --git a/ChangeLog b/ChangeLog
index 88d692401..36faf2921 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2009-07-03  suzuki toshiya <mpsuzuki@hiroshima-u.ac.jp>
+
+	gzip: Distinguish PureC from TurboC on MSDOS.
+
+	* src/gzip/zutil.c (zcalloc, zcfree): Enable only for
+	MSDOS platform.
+
 2009-07-03  suzuki toshiya <mpsuzuki@hiroshima-u.ac.jp>
 
 	gxvalid: Insert PureC pragma to allow unevaluated variables.
diff --git a/src/gzip/zutil.c b/src/gzip/zutil.c
index 0b47dd420..9d8beae3e 100644
--- a/src/gzip/zutil.c
+++ b/src/gzip/zutil.c
@@ -49,7 +49,7 @@ void zmemzero(dest, len)
 }
 #endif
 
-#ifdef __TURBOC__
+#if defined( MSDOS ) && defined( __TURBOC__ )
 #if (defined( __BORLANDC__) || !defined(SMALL_MEDIUM)) && !defined(__32BIT__)
 /* Small and medium model in Turbo C are for now limited to near allocation
  * with reduced MAX_WBITS and MAX_MEM_LEVEL
@@ -126,7 +126,7 @@ void  zcfree (voidpf opaque, voidpf ptr)
     Assert(0, "zcfree: ptr not found");
 }
 #endif
-#endif /* __TURBOC__ */
+#endif /* MSDOS && __TURBOC__ */
 
 
 #if defined(M_I86) && !defined(__32BIT__)