diff --git a/libs/binder/Parcel.cpp b/libs/binder/Parcel.cpp
index dee5309..805e576 100644
--- a/libs/binder/Parcel.cpp
+++ b/libs/binder/Parcel.cpp
@@ -411,8 +411,9 @@
 
 status_t Parcel::appendFrom(const Parcel *parcel, size_t offset, size_t len)
 {
-    if (parcel->isForRpc() != isForRpc()) {
-        ALOGE("Cannot append Parcel of one format to another.");
+    if (mSession != parcel->mSession) {
+        ALOGE("Cannot append Parcel from one context to another. They may be different formats, "
+              "and objects are specific to a context.");
         return BAD_TYPE;
     }
 
diff --git a/libs/binder/tests/binderRpcTest.cpp b/libs/binder/tests/binderRpcTest.cpp
index d68c6ff..8267702 100644
--- a/libs/binder/tests/binderRpcTest.cpp
+++ b/libs/binder/tests/binderRpcTest.cpp
@@ -690,13 +690,21 @@
 }
 
 TEST_P(BinderRpc, AppendSeparateFormats) {
-    auto proc = createRpcTestSocketServerProcess({});
+    auto proc1 = createRpcTestSocketServerProcess({});
+    auto proc2 = createRpcTestSocketServerProcess({});
+
+    Parcel pRaw;
 
     Parcel p1;
-    p1.markForBinder(proc.rootBinder);
+    p1.markForBinder(proc1.rootBinder);
     p1.writeInt32(3);
 
+    EXPECT_EQ(BAD_TYPE, p1.appendFrom(&pRaw, 0, p1.dataSize()));
+    EXPECT_EQ(BAD_TYPE, pRaw.appendFrom(&p1, 0, p1.dataSize()));
+
     Parcel p2;
+    p2.markForBinder(proc2.rootBinder);
+    p2.writeInt32(7);
 
     EXPECT_EQ(BAD_TYPE, p1.appendFrom(&p2, 0, p2.dataSize()));
     EXPECT_EQ(BAD_TYPE, p2.appendFrom(&p1, 0, p1.dataSize()));