diff --git a/REQUIRE b/REQUIRE
index 3b75853..cbbf701 100644
--- a/REQUIRE
+++ b/REQUIRE
@@ -3,5 +3,5 @@ ODEInterface 0.1.3
 DiffEqBase 4.29.0
 Compat 0.17.0
 Reexport
-DataStructures
+DataStructures 0.15.0
 FunctionWrappers
diff --git a/src/solve.jl b/src/solve.jl
index 38fcd96..dc59254 100644
--- a/src/solve.jl
+++ b/src/solve.jl
@@ -202,9 +202,9 @@ function saveat_disc_handling(saveat,tdir,tspan,tType)
   end
 
   if tdir>0
-    saveat_internal = binary_minheap(saveat_vec)
+    saveat_internal = BinaryMinHeap(saveat_vec)
   else
-    saveat_internal = binary_maxheap(saveat_vec)
+    saveat_internal = BinaryMaxHeap(saveat_vec)
   end
 
   saveat_internal