diff --git a/src/internal/sio_packet.cpp b/src/internal/sio_packet.cpp
index 4b810987..3d31cf13 100644
--- a/src/internal/sio_packet.cpp
+++ b/src/internal/sio_packet.cpp
@@ -134,6 +134,10 @@ namespace sio
         {
             return int_message::create(value.GetInt64());
         }
+        else if (value.IsUint64())
+        {
+          return int_message::create(static_cast<int64_t>(value.GetUint64()));
+        }
         else if(value.IsDouble())
         {
             return double_message::create(value.GetDouble());
@@ -176,14 +180,14 @@ namespace sio
             }
             return ptr;
         }
-		else if(value.IsBool())
-		{
-			return bool_message::create(value.GetBool());
-		}
-		else if(value.IsNull())
-		{
-			return null_message::create();
-		}
+        else if(value.IsBool())
+        {
+            return bool_message::create(value.GetBool());
+        }
+        else if(value.IsNull())
+        {
+            return null_message::create();
+        }
         return message::ptr();
     }
 
diff --git a/test/sio_test.cpp b/test/sio_test.cpp
index 3901f05e..bd6d352d 100644
--- a/test/sio_test.cpp
+++ b/test/sio_test.cpp
@@ -234,3 +234,23 @@ TEST_CASE( "test_packet_parse_4" )
     CHECK(array->get_vector()[2]->get_string() == "text");
 
 }
+
+/*
+ * Test parsing of UInt64 values. See #174.
+ */
+TEST_CASE( "test_packet_parse_5" )
+{
+    packet p;
+    bool hasbin = p.parse("42/nsp,1001[\"event\",17657333360744292000]");
+    CHECK(!hasbin);
+    CHECK(p.get_frame() == packet::frame_message);
+    CHECK(p.get_type() == packet::type_event);
+    CHECK(p.get_nsp() == "/nsp");
+    CHECK(p.get_pack_id() == 1001);
+    CHECK(p.get_message()->get_flag() == message::flag_array);
+    REQUIRE(p.get_message()->get_vector().size() == 2);
+    REQUIRE(p.get_message()->get_vector()[0]->get_flag() == message::flag_string);
+    CHECK(p.get_message()->get_vector()[0]->get_string() == "event");
+    REQUIRE(p.get_message()->get_vector()[1]->get_flag() == message::flag_integer);
+    CHECK(p.get_message()->get_vector()[1]->get_int() == 17657333360744292000U);
+}