diff --git a/src/lens.jl b/src/lens.jl
index 1c8c78c..c4792c2 100644
--- a/src/lens.jl
+++ b/src/lens.jl
@@ -223,10 +223,16 @@ end
 Base.@propagate_inbounds function get(obj, l::IndexLens)
     getindex(obj, l.indices...)
 end
+
 Base.@propagate_inbounds function set(obj, l::IndexLens, val)
     setindex(obj, val, l.indices...)
 end
 
+
+Base.@propagate_inbounds function set!(obj, l::IndexLens, val)
+    setindex!(obj, val, l.indices...)
+end
+
 """
     ConstIndexLens{I}