diff --git a/src/measure/utTc.erl b/src/measure/utTc.erl
index df59e10..dce567d 100644
--- a/src/measure/utTc.erl
+++ b/src/measure/utTc.erl
@@ -39,7 +39,7 @@ tc(M, F, A) ->
    Time = cvrTimeUnit(T2 - T1, native, nanosecond),
    {Time, Val}.
 
--spec cvrTimeUnit(Time :: integer(), FromUnit :: time_unit(), ToUnit :: erlang:time_unit()) -> ConvertedTime :: integer().
+-spec cvrTimeUnit(Time :: integer(), FromUnit :: erlang:time_unit(), ToUnit :: erlang:time_unit()) -> ConvertedTime :: integer().
 cvrTimeUnit(Time, FromUnit, ToUnit) ->
    try
       FU =