diff --git a/src/instruct.jl b/src/instruct.jl
index 3a3b320d2..4c238d0f0 100644
--- a/src/instruct.jl
+++ b/src/instruct.jl
@@ -73,9 +73,10 @@ end
 
 YaoBase.instruct!(state::AbstractVecOrMat, U::IMatrix, locs::NTuple{N, Int}) where N = state
 YaoBase.instruct!(state::AbstractVecOrMat, U::IMatrix, locs::Int)  = state
+YaoBase.instruct!(state::AbstractVecOrMat, U::IMatrix, locs::Tuple{Int}) = state
 
 # one-qubit instruction
-YaoBase.instruct!(state::AbstractVecOrMat{T}, g::AbstractMatrix{T}, locs::Tuple{Int}) where T =
+YaoBase.instruct!(state::AbstractVecOrMat, g::AbstractMatrix, locs::Tuple{Int}) =
     instruct!(state, g, locs...)
 
 function YaoBase.instruct!(state::AbstractVecOrMat{T}, U1::AbstractMatrix{T}, loc::Int) where T
diff --git a/test/instruct.jl b/test/instruct.jl
index 317b07289..58a249847 100644
--- a/test/instruct.jl
+++ b/test/instruct.jl
@@ -90,3 +90,8 @@ end
     ST = randn(ComplexF64, 1 << 2)
     @test instruct!(copy(ST), Val(:SWAP), (1, 2)) ≈ SWAP * ST
 end
+
+@testset "Yao.jl/#189" begin
+    st = rand(1<<4)
+    @test instruct!(st, IMatrix{2, Float64}(), 1) == st
+end