diff --git a/src/protocol.cpp b/src/protocol.cpp
--- a/src/protocol.cpp
+++ b/src/protocol.cpp
@@ -282,11 +282,7 @@
             std::ostringstream stream;
             stream.imbue(std::locale::classic());
             stream << "UNKNOWN[";
-            if (bit < 8) {
-                stream << mask;
-            } else {
-                stream << "2^" << bit;
-            }
+            stream << "2^" << bit;
             stream << "]";
             return stream.str();
     }
diff --git a/test/functional/rpc_net.py b/test/functional/rpc_net.py
--- a/test/functional/rpc_net.py
+++ b/test/functional/rpc_net.py
@@ -60,6 +60,7 @@
         self._test_getnetworkinfo()
         self._test_getaddednodeinfo()
         self._test_getpeerinfo()
+        self.test_service_flags()
         self._test_getnodeaddresses()
 
     def _test_connection_count(self):
@@ -159,6 +160,15 @@
             assert_net_servicesnames(int(info[0]["services"], 0x10),
                                      info[0]["servicesnames"])
 
+    def test_service_flags(self):
+        self.nodes[0].add_p2p_connection(
+            P2PInterface(), services=(
+                1 << 5) | (
+                1 << 63))
+        assert_equal(['UNKNOWN[2^5]', 'UNKNOWN[2^63]'],
+                     self.nodes[0].getpeerinfo()[-1]['servicesnames'])
+        self.nodes[0].disconnect_p2ps()
+
     def _test_getnodeaddresses(self):
         self.nodes[0].add_p2p_connection(P2PInterface())