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-rw-r--r--lib/pop3.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/pop3.h b/lib/pop3.h
index 1964d72e4..fcc839578 100644
--- a/lib/pop3.h
+++ b/lib/pop3.h
@@ -93,7 +93,7 @@ extern const struct Curl_handler Curl_handler_pop3s;
/* Authentication type values */
#define POP3_TYPE_NONE 0
-#define POP3_TYPE_ANY ~0
+#define POP3_TYPE_ANY ~0U
/* This is the 5-bytes End-Of-Body marker for POP3 */
#define POP3_EOB "\x0d\x0a\x2e\x0d\x0a"