diff --git a/src/series.jl b/src/series.jl
index 84f3cc21..c0d7d4c2 100644
--- a/src/series.jl
+++ b/src/series.jl
@@ -371,7 +371,7 @@ end
 end
 
 # try some intervals over which the function may be defined
-function tryrange(F::T, vec) where T <: AbstractArray
+function tryrange(F::AbstractArray, vec) 
     rets = [tryrange(f, vec) for f in F] # get the preferred for each
     maxind = maximum(indexin(rets, vec)) # get the last attempt that succeeded (most likely to fit all)
     rets .= [tryrange(f, vec[maxind:maxind]) for f in F] # ensure that all functions compute there