diff --git a/src/ua-parser.js b/src/ua-parser.js
index 8727c92..15d1c98 100755
--- a/src/ua-parser.js
+++ b/src/ua-parser.js
@@ -707,7 +707,7 @@
             /\((bb)(10);/i                                                      // BlackBerry 10
             ], [[NAME, 'BlackBerry'], VERSION], [
             /(blackberry)\w*\/?([\w\.]*)/i,                                     // Blackberry
-            /(tizen)[\/\s]([\w\.]+)/i,                                          // Tizen
+            /(tizen|kaios)[\/\s]([\w\.]+)/i,                                    // Tizen/KaiOS
             /(android|webos|palm\sos|qnx|bada|rim\stablet\sos|meego|sailfish|contiki)[\/\s-]?([\w\.]*)/i
                                                                                 // Android/WebOS/Palm/QNX/Bada/RIM/MeeGo/Contiki/Sailfish OS
             ], [NAME, VERSION], [
diff --git a/test/os-test.json b/test/os-test.json
index a2a2411..b944ac0 100644
--- a/test/os-test.json
+++ b/test/os-test.json
@@ -548,6 +548,15 @@
             "version" : "R1"
         }
     },
+    {
+        "desc"    : "KaiOS",
+        "ua"      : "Mozilla/5.0 (Mobile; Nokia_8110_4G; rv:48.0) Gecko/48.0 Firefox/48.0 KAIOS/2.5",
+        "expect"  :
+        {
+            "name"    : "KAIOS",
+            "version" : "2.5"
+        }
+    },
     {
         "desc"    : "AIX",
         "ua"      : "",