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-rw-r--r--lib/libc/stdio/vfprintf.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/libc/stdio/vfprintf.c b/lib/libc/stdio/vfprintf.c
index 0d78df9..2d720ae 100644
--- a/lib/libc/stdio/vfprintf.c
+++ b/lib/libc/stdio/vfprintf.c
@@ -642,7 +642,7 @@ __vfprintf(FILE *fp, const char *fmt0, va_list ap)
decimal_point = localeconv()->decimal_point;
#endif
/* sorry, fprintf(read_only_file, "") returns EOF, not 0 */
- if (cantwrite(fp))
+ if (prepwrite(fp) != 0)
return (EOF);
/* optimise fprintf(stderr) (and other unbuffered Unix files) */
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