diff --git a/src/heaps/mutable_binary_heap.jl b/src/heaps/mutable_binary_heap.jl
index abc87d0d6..56be6b0e6 100644
--- a/src/heaps/mutable_binary_heap.jl
+++ b/src/heaps/mutable_binary_heap.jl
@@ -136,10 +136,10 @@ function _make_mutable_binary_heap(ord::Ordering, ty::Type{T}, values) where T
     n = length(values)
     nodes = Vector{MutableBinaryHeapNode{T}}(undef, n)
     nodemap = Vector{Int}(undef, n)
-    values = heapify!(values, ord)
+    valtree = heapify!(values, ord)
 
     i::Int = 0
-    for v in values
+    for v in valtree
         i += 1
         @inbounds nodes[i] = MutableBinaryHeapNode{T}(v, i)
         @inbounds nodemap[i] = i