diff --git a/lib/ldclient-rb/impl/context_filter.rb b/lib/ldclient-rb/impl/context_filter.rb
index bec00400..3e8c9f6a 100644
--- a/lib/ldclient-rb/impl/context_filter.rb
+++ b/lib/ldclient-rb/impl/context_filter.rb
@@ -70,7 +70,7 @@ def filter_redact_anonymous(context)
         filtered[:anonymous] = true if anonymous
 
         redacted = []
-        private_attributes = @private_attributes.concat(context.private_attributes)
+        private_attributes = @private_attributes + context.private_attributes
 
         name = context.get_value(:name)
         if !name.nil? && !check_whole_attribute_private(:name, private_attributes, redacted, anonymous && redact_anonymous)
diff --git a/spec/impl/context_filter_spec.rb b/spec/impl/context_filter_spec.rb
new file mode 100644
index 00000000..000849c9
--- /dev/null
+++ b/spec/impl/context_filter_spec.rb
@@ -0,0 +1,29 @@
+require "spec_helper"
+
+module LaunchDarkly
+  module Impl
+    describe ContextFilter do
+      it "does not apply per-context private attributes to later contexts" do
+        filter = ContextFilter.new(false, [])
+        private_context = LDContext.create({ kind: "user", key: "user-key", email: "email", _meta: { privateAttributes: ["email"] } })
+        other_context = LDContext.create({ kind: "user", key: "other-key", email: "email" })
+
+        expect(filter.filter(private_context)[:_meta][:redactedAttributes]).to eq([:email])
+        expect(filter.filter(other_context)).to eq({ key: "other-key", kind: "user", email: "email" })
+      end
+
+      it "does not apply private attributes of one kind to the other kinds of a multi-kind context" do
+        filter = ContextFilter.new(false, [])
+        context = LDContext.create_multi([
+                                           LDContext.create({ kind: "user", key: "user-key", email: "email", _meta: { privateAttributes: ["email"] } }),
+          LDContext.create({ kind: "org", key: "org-key", email: "email" }),
+                                         ])
+
+        filtered = filter.filter(context)
+
+        expect(filtered["user"][:_meta][:redactedAttributes]).to eq([:email])
+        expect(filtered["org"]).to eq({ key: "org-key", email: "email" })
+      end
+    end
+  end
+end