diff --git a/src/mpems.jl b/src/mpems.jl
index 22255a1..54bc712 100644
--- a/src/mpems.jl
+++ b/src/mpems.jl
@@ -155,7 +155,7 @@ function mpem2(B::PeriodicMPEM3{F}) where {F}
 end
 
 
-mpem3from2(::Type{MPEM2{F}}) where F = MPEM3
-mpem3from2(::Type{PeriodicMPEM2{F}}) where F = PeriodicMPEM3
+mpem3from2(::Type{<:MPEM2}) = MPEM3
+mpem3from2(::Type{<:PeriodicMPEM2}) = PeriodicMPEM3
 
-default_truncator(::Type{<:AbstractMPEM2}) = TruncThresh(1e-6)
\ No newline at end of file
+default_truncator(::Type{<:AbstractMPEM2}) = TruncThresh(1e-6)
diff --git a/src/stationary.jl b/src/stationary.jl
index e2131c3..14d1dc8 100644
--- a/src/stationary.jl
+++ b/src/stationary.jl
@@ -40,7 +40,7 @@ function mpem2(B::InfiniteUniformMPEM3{F}) where {F}
     return InfiniteUniformMPEM2{F}(D; z = B.z)
 end
 
-mpem3from2(::Type{InfiniteUniformMPEM2{F}}) where F = InfiniteUniformMPEM3
+mpem3from2(::Type{<:InfiniteUniformMPEM2}) = InfiniteUniformMPEM3
 
 
 #### Naive MPBP
@@ -292,4 +292,4 @@ function (cb::CB_BPVUMPS)(bp::MPBPStationary, it::Integer, svd_trunc::SVDTrunc)
     next!(cb.prog, showvalues=[(:Δ,Δ), (:trunc, summary_compact(svd_trunc))])
     flush(stdout)
     return Δ
-end
\ No newline at end of file
+end