diff --git a/syncplay/constants.py b/syncplay/constants.py
index 84360ac..af63ae1 100644
--- a/syncplay/constants.py
+++ b/syncplay/constants.py
@@ -50,6 +50,6 @@ MPC_PAUSE_TOGGLE_DELAY = 0.05
 MPLAYER_SLAVE_ARGS = [ '-slave', '-msglevel', 'all=1:global=4']
 MPLAYER_ANSWER_REGEX = "^ANS_([a-zA-Z_]+)=(.+)$"
 UI_COMMAND_REGEX = r"^(?P<command>[^\ ]+)(?:\ (?P<parameter>.+))?"
-UI_OFFSET_REGEX = r"^(?:o|offset)\ ?(?P<sign>[/+-])?(?P<time>\d+(?:[^\d\.](?:\d+)){0,2}(?:\.(?:\d+))?)$"
-UI_SEEK_REGEX = r"^(?:s|seek)?\ ?(?P<sign>[+-])?(?P<time>\d+(?:[^\d\.](?:\d+)){0,2}(?:\.(?:\d+))?)$"
+UI_OFFSET_REGEX = r"^(?:o|offset)\ ?(?P<sign>[/+-])?(?P<time>\d{1,4}(?:[^\d\.](?:\d{1,6})){0,2}(?:\.(?:\d{1,3}))?)$"
+UI_SEEK_REGEX = r"^(?:s|seek)?\ ?(?P<sign>[+-])?(?P<time>\d{1,4}(?:[^\d\.](?:\d{1,6})){0,2}(?:\.(?:\d{1,3}))?)$"
 PARSE_TIME_REGEX = r'(:?(?:(?P<hours>\d+?)[^\d\.])?(?:(?P<minutes>\d+?))?[^\d\.])?(?P<seconds>\d+?)(?:\.(?P<miliseconds>\d+?))?$'