diff --git a/src/blockindices.jl b/src/blockindices.jl
index bc538a06..b1b1fc44 100644
--- a/src/blockindices.jl
+++ b/src/blockindices.jl
@@ -172,7 +172,7 @@ end
 @inline BlockIndex(::Tuple{}, b::Tuple{}) = BlockIndex{0,Tuple{},Tuple{}}((), ())
 
 @inline BlockIndex(a::Integer, b) = BlockIndex((a,), (b,))
-@inline BlockIndex(a::Tuple, b) = BlockIndex(a, (b,))
+@inline BlockIndex(a::NTuple{N, Integer}, b) where {N} = BlockIndex(a, (b,))
 @inline BlockIndex(a::Integer, b::Tuple) = BlockIndex((a,), b)
 @inline BlockIndex() = BlockIndex((), ())
 
diff --git a/test/test_blockindices.jl b/test/test_blockindices.jl
index 02c87dfc..ef60822d 100644
--- a/test/test_blockindices.jl
+++ b/test/test_blockindices.jl
@@ -113,6 +113,7 @@ import BlockArrays: split_index, merge_indices
         @test copy(Block(1)[1:2]) === BlockIndexRange(Block(1),1:2)
         @test copy(Block(1)[[1,3]]) == BlockIndices(Block(1),[1,3])
         @test copy(Block(1)[[1,3]]) ≢ BlockIndices(Block(1),[1,3])
+        @test_throws MethodError BlockIndex((1.0, 2.0), (1, 2))
     end
 
     @testset "BlockIndices" begin