diff --git a/src/slack-timedate.cpp b/src/slack-timedate.cpp
index 223ce78..41a4961 100644
--- a/src/slack-timedate.cpp
+++ b/src/slack-timedate.cpp
@@ -169,7 +169,9 @@ namespace dlackware::timedate
 
         try
         {
-            introspection_data = Gio::DBus::NodeInfo::create_for_xml(INTROSPECTION_XML);
+            auto introspection_xml = Glib::file_get_contents(dlackware::timedate::introspection_xml);
+
+            introspection_data = Gio::DBus::NodeInfo::create_for_xml(introspection_xml);
         }
         catch (Glib::Error& slack_err)
         {
@@ -303,19 +305,19 @@ gboolean slack_set_time(gint64 seconds_since_epoch, gboolean relative)
         {
             return FALSE;
         }
-        ts.tv_sec += static_cast<time_t>(seconds_since_epoch / USEC_PER_SEC);
-        ts.tv_nsec += (seconds_since_epoch % USEC_PER_SEC) * NSEC_PER_USEC;
+        ts.tv_sec += static_cast<time_t>(seconds_since_epoch / dlackware::timedate::usec_per_sec);
+        ts.tv_nsec += (seconds_since_epoch % dlackware::timedate::usec_per_sec) * dlackware::timedate::nsec_per_usec;
 
         if (ts.tv_nsec < 0)
         {
             --ts.tv_sec;
-            ts.tv_nsec += USEC_PER_SEC;
+            ts.tv_nsec += dlackware::timedate::usec_per_sec;
         }
     }
     else
     {
-        ts.tv_sec = static_cast<time_t>(seconds_since_epoch / USEC_PER_SEC);
-        ts.tv_nsec = (seconds_since_epoch % USEC_PER_SEC) * NSEC_PER_USEC;
+        ts.tv_sec = static_cast<time_t>(seconds_since_epoch / dlackware::timedate::usec_per_sec);
+        ts.tv_nsec = (seconds_since_epoch % dlackware::timedate::usec_per_sec) * dlackware::timedate::nsec_per_usec;
     }
     return clock_settime (CLOCK_REALTIME, &ts) == 0;
 }
diff --git a/src/slack-timedate.h b/src/slack-timedate.h
index a687ab0..41eb0e7 100644
--- a/src/slack-timedate.h
+++ b/src/slack-timedate.h
@@ -23,46 +23,16 @@
 
 #define BUS_NAME "org.freedesktop.timedate1"
 #define BUS_PATH "/org/freedesktop/timedate1"
-#define BUS_INTERFACE "org.freedesktop.timedate1"
-
-#define INTROSPECTION_XML DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE \
-	"<node>\n" \
-	" <interface name=\"org.freedesktop.timedate1\">\n"             \
-	"  <property name=\"Timezone\" type=\"s\" access=\"read\"/>\n"  \
-	"  <property name=\"LocalRTC\" type=\"b\" access=\"read\"/>\n"  \
-	"  <property name=\"NTP\" type=\"b\" access=\"read\"/>\n"       \
-	"  <method name=\"SetTime\">\n"                                 \
-	"   <arg name=\"usec_utc\" type=\"x\" direction=\"in\"/>\n"     \
-	"   <arg name=\"relative\" type=\"b\" direction=\"in\"/>\n"     \
-	"   <arg name=\"user_interaction\" type=\"b\" direction=\"in\"/>\n" \
-	"  </method>\n"                                                 \
-	"  <method name=\"SetTimezone\">\n"                             \
-	"   <arg name=\"timezone\" type=\"s\" direction=\"in\"/>\n"     \
-	"   <arg name=\"user_interaction\" type=\"b\" direction=\"in\"/>\n" \
-	"  </method>\n"                                                 \
-	"  <method name=\"SetLocalRTC\">\n"                             \
-	"   <arg name=\"local_rtc\" type=\"b\" direction=\"in\"/>\n"    \
-	"   <arg name=\"fix_system\" type=\"b\" direction=\"in\"/>\n"   \
-	"   <arg name=\"user_interaction\" type=\"b\" direction=\"in\"/>\n" \
-	"  </method>\n"                                                 \
-	"  <method name=\"SetNTP\">\n"                                  \
-	"   <arg name=\"use_ntp\" type=\"b\" direction=\"in\"/>\n"      \
-	"   <arg name=\"user_interaction\" type=\"b\" direction=\"in\"/>\n" \
-	"  </method>\n"                                                 \
-	"  <method name=\"ListTimezones\">\n"                           \
-	"   <arg name=\"timezones\" type=\"as\" direction=\"out\"/>\n"  \
-	"  </method>"                                                   \
-	" </interface>\n"												\
-	"</node>\n"
 
 #define DEFAULT_EXIT_SEC 300
 
-constexpr gint32 USEC_PER_SEC = 1000000ULL;
-constexpr gint32 NSEC_PER_USEC = 1000ULL;
-
 namespace dlackware::timedate
 {
     constexpr const char *zoneinfo_database = "/usr/share/zoneinfo";
+    constexpr const char *introspection_xml = "/usr/share/dbus-1/interfaces/org.freedesktop.timedate1.xml";
+
+    constexpr const gint32 usec_per_sec = 1000000ULL;
+    constexpr const gint32 nsec_per_usec = 1000ULL;
 
     // Returns the system time zone.
     Glib::ustring timezone();