diff --git a/ext/snmp/snmp.c b/ext/snmp/snmp.c
index 672ac9a94b4f..61f15850c33c 100644
--- a/ext/snmp/snmp.c
+++ b/ext/snmp/snmp.c
@@ -1273,7 +1273,7 @@ static void php_snmp(INTERNAL_FUNCTION_PARAMETERS, int st, int version)
 					Z_PARAM_LONG(retries)
 				ZEND_PARSE_PARAMETERS_END();
 
-				timeout_argument_offset = 10;
+				timeout_argument_offset = 11;
 			} else {
 				/* SNMP_CMD_GET
 				 * SNMP_CMD_GETNEXT
diff --git a/ext/snmp/tests/snmp3_set_timeout_argument.phpt b/ext/snmp/tests/snmp3_set_timeout_argument.phpt
new file mode 100644
index 000000000000..2a3c63ed09ef
--- /dev/null
+++ b/ext/snmp/tests/snmp3_set_timeout_argument.phpt
@@ -0,0 +1,18 @@
+--TEST--
+snmp3_set() - an invalid timeout or retries cites the right argument
+--EXTENSIONS--
+snmp
+--FILE--
+<?php
+$oid = '.1.3.6.1.2.1.1.5.0';
+foreach ([[-2, 1], [100, -2]] as [$timeout, $retries]) {
+    try {
+        snmp3_set('127.0.0.1', 'user', 'noAuthNoPriv', '', '', '', '', $oid, 's', 'x', $timeout, $retries);
+    } catch (Throwable $e) {
+        echo $e::class, ': ', $e->getMessage(), "\n";
+    }
+}
+?>
+--EXPECTF--
+ValueError: snmp3_set(): Argument #11 ($timeout) must be between -1 and %d
+ValueError: snmp3_set(): Argument #12 ($retries) must be between -1 and %d