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-rw-r--r--include/ruby/win32.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/ruby/win32.h b/include/ruby/win32.h
index a340586d32..c9a03f0a23 100644
--- a/include/ruby/win32.h
+++ b/include/ruby/win32.h
@@ -134,7 +134,7 @@ extern DWORD rb_w32_osid(void);
#define utime(_p, _t) rb_w32_utime(_p, _t)
#define lseek(_f, _o, _w) _lseeki64(_f, _o, _w)
-#define pipe(p) _pipe(p, 2048L, O_BINARY)
+#define pipe(p) _pipe(p, 65536L, O_BINARY)
#define close(h) rb_w32_close(h)
#define fclose(f) rb_w32_fclose(f)
#define read(f, b, s) rb_w32_read(f, b, s)