diff --git a/src/treelike.jl b/src/treelike.jl
index 4d896771..cac90e4e 100644
--- a/src/treelike.jl
+++ b/src/treelike.jl
@@ -40,6 +40,14 @@ end
 
 params(m...) = params(m)
 
+function loadparams!(m, xs)
+  for (p, x) in zip(params(m), xs)
+    size(p) == size(x) ||
+      error("Expected param size $(size(p)), got $(size(x))")
+    copy!(data(p), data(x))
+  end
+end
+
 # CPU/GPU movement conveniences
 
 cpu(m) = mapleaves(x -> adapt(Array, x), m)