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-rw-r--r--ext/standard/mail.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/standard/mail.c b/ext/standard/mail.c
index db5658c26e..6c5f3ec9cf 100644
--- a/ext/standard/mail.c
+++ b/ext/standard/mail.c
@@ -58,7 +58,7 @@
#define MAIL_ASCIIZ_CHECK(str, len) \
p = str; \
e = p + len; \
- while (p = memchr(p, '\0', (e - p))) { \
+ while ((p = memchr(p, '\0', (e - p)))) { \
*p = ' '; \
} \