diff --git a/libs/HMMTest/src/allocations.jl b/libs/HMMTest/src/allocations.jl
index 8deedaf..b75e348 100644
--- a/libs/HMMTest/src/allocations.jl
+++ b/libs/HMMTest/src/allocations.jl
@@ -7,7 +7,7 @@ function test_allocations(
     hmm_guess::Union{Nothing,AbstractHMM}=nothing,
 )
     # making seq_ends a tuple disables multithreading
-    seq_ends = ntuple(k -> seq_ends[k], Val(min(2, length(seq_ends))))
+    seq_ends = ntuple(k -> seq_ends[k], Val(min(1, length(seq_ends))))
     control_seq = control_seq[1:last(seq_ends)]
 
     @testset "Allocations" begin
diff --git a/src/inference/forward.jl b/src/inference/forward.jl
index 615c70a..5e6e251 100644
--- a/src/inference/forward.jl
+++ b/src/inference/forward.jl
@@ -123,7 +123,7 @@ function forward!(
     control_seq::AbstractVector;
     seq_ends::AbstractVectorOrNTuple{Int},
 )
-    if seq_ends isa NTuple
+    if seq_ends isa NTuple{1}
         for k in eachindex(seq_ends)
             _forward!(storage, hmm, obs_seq, control_seq, seq_ends, k)
         end
diff --git a/src/inference/forward_backward.jl b/src/inference/forward_backward.jl
index 44f5aba..ba51ad4 100644
--- a/src/inference/forward_backward.jl
+++ b/src/inference/forward_backward.jl
@@ -81,7 +81,7 @@ function forward_backward!(
     seq_ends::AbstractVectorOrNTuple{Int},
     transition_marginals::Bool=true,
 )
-    if seq_ends isa NTuple
+    if seq_ends isa NTuple{1}
         for k in eachindex(seq_ends)
             _forward_backward!(
                 storage, hmm, obs_seq, control_seq, seq_ends, k; transition_marginals
diff --git a/src/inference/viterbi.jl b/src/inference/viterbi.jl
index c20632c..f4f5270 100644
--- a/src/inference/viterbi.jl
+++ b/src/inference/viterbi.jl
@@ -83,7 +83,7 @@ function viterbi!(
     control_seq::AbstractVector;
     seq_ends::AbstractVectorOrNTuple{Int},
 ) where {R}
-    if seq_ends isa NTuple
+    if seq_ends isa NTuple{1}
         for k in eachindex(seq_ends)
             _viterbi!(storage, hmm, obs_seq, control_seq, seq_ends, k)
         end