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-rw-r--r--include/ruby/win32.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/ruby/win32.h b/include/ruby/win32.h
index 4a56895a84..4d8a66742f 100644
--- a/include/ruby/win32.h
+++ b/include/ruby/win32.h
@@ -693,8 +693,8 @@ int rb_w32_wopen(const WCHAR *, int, ...);
int rb_w32_close(int);
int rb_w32_fclose(FILE*);
int rb_w32_pipe(int[2]);
-size_t rb_w32_read(int, void *, size_t);
-size_t rb_w32_write(int, const void *, size_t);
+ssize_t rb_w32_read(int, void *, size_t);
+ssize_t rb_w32_write(int, const void *, size_t);
int rb_w32_utime(const char *, const struct utimbuf *);
int rb_w32_uutime(const char *, const struct utimbuf *);
long rb_w32_write_console(uintptr_t, int); /* use uintptr_t instead of VALUE because it's not defined yet here */