diff --git a/tools/libvirt-guests.sh.in b/tools/libvirt-guests.sh.in
index 1b17bbe42a103ed312758b62d3520fe0c3522177..9aa06fa2b3da25c724b86e94256c416a13a34e13 100644
--- a/tools/libvirt-guests.sh.in
+++ b/tools/libvirt-guests.sh.in
@@ -171,7 +171,9 @@ start() {
 
     isfirst=true
     bypass=
+    sync_time=false
     test "x$BYPASS_CACHE" = x0 || bypass=--bypass-cache
+    test "x$SYNC_TIME" = x0 || sync_time=true
     while read uri list; do
         configured=false
         set -f
@@ -206,6 +208,9 @@ start() {
                     retval run_virsh "$uri" start $bypass "$name" \
                         >/dev/null && \
                     gettext "done"; echo
+                    if "$sync_time"; then
+                        run_virsh "$uri" domtime --sync "$name" >/dev/null
+                    fi
                 fi
             fi
         done
diff --git a/tools/libvirt-guests.sysconf b/tools/libvirt-guests.sysconf
index d1f20510c009eb0a33425d7d7cc79beea2194a84..277005677b3118a607a90a85894f642fa137113f 100644
--- a/tools/libvirt-guests.sysconf
+++ b/tools/libvirt-guests.sysconf
@@ -39,3 +39,10 @@
 # restoring guests, even though this may give slower operation for
 # some file systems.
 #BYPASS_CACHE=0
+
+# If non-zero, try to sync guest time on domain resume. Be aware, that
+# this requires guest agent with support for time synchronization
+# running in the guest. For instance, qemu-ga doesn't support guest time
+# synchronization on Windows guests, but Linux ones. By default, this
+# functionality is turned off.
+#SYNC_TIME=1