diff --git a/plugins/inputs/snmp/snmp.go b/plugins/inputs/snmp/snmp.go
index 2fc56ff97..2f8bf6d5b 100644
--- a/plugins/inputs/snmp/snmp.go
+++ b/plugins/inputs/snmp/snmp.go
@@ -804,9 +804,9 @@ func fieldConvert(conv string, v interface{}) (interface{}, error) {
 		case uint64:
 			v = int64(vt)
 		case []byte:
-			v, _ = strconv.Atoi(string(vt))
+			v, _ = strconv.ParseInt(string(vt), 10, 64)
 		case string:
-			v, _ = strconv.Atoi(vt)
+			v, _ = strconv.ParseInt(vt, 10, 64)
 		}
 		return v, nil
 	}
diff --git a/plugins/inputs/snmp/snmp_test.go b/plugins/inputs/snmp/snmp_test.go
index 25382bd7d..d29b525ad 100644
--- a/plugins/inputs/snmp/snmp_test.go
+++ b/plugins/inputs/snmp/snmp_test.go
@@ -694,6 +694,8 @@ func TestFieldConvert(t *testing.T) {
 		{uint64(123), "float(3)", float64(0.123)},
 		{"123", "int", int64(123)},
 		{[]byte("123"), "int", int64(123)},
+		{"123123123123", "int", int64(123123123123)},
+		{[]byte("123123123123"), "int", int64(123123123123)},
 		{float32(12.3), "int", int64(12)},
 		{float64(12.3), "int", int64(12)},
 		{int(123), "int", int64(123)},