diff --git a/java-storage/google-cloud-storage/src/main/java/com/google/cloud/storage/StorageDataClient.java b/java-storage/google-cloud-storage/src/main/java/com/google/cloud/storage/StorageDataClient.java
index cd3570a3a679..a531d55974cf 100644
--- a/java-storage/google-cloud-storage/src/main/java/com/google/cloud/storage/StorageDataClient.java
+++ b/java-storage/google-cloud-storage/src/main/java/com/google/cloud/storage/StorageDataClient.java
@@ -84,6 +84,10 @@ ApiFuture<ObjectReadSession> readSession(
         req.getReadRangesList().isEmpty(),
         "ranges included in the initial request are not supported");
     checkArgument(fastOpenConfigs.size() <= 1, "at most one fast open read is supported");
+    checkArgument(
+        fastOpenConfigs.stream().allMatch(c -> c.getType() == ProjectionType.STREAM_READ),
+        "a fast open read must be asFutureBytes(), asFutureByteString() or asChannel(), but was %s",
+        fastOpenConfigs);
     ObjectReadSessionState state = new ObjectReadSessionState(ctx, req);
 
     ZeroCopyBidiStreamingCallable<BidiReadObjectRequest, BidiReadObjectResponse> callable =
diff --git a/java-storage/google-cloud-storage/src/test/java/com/google/cloud/storage/ITFastOpenFakeTest.java b/java-storage/google-cloud-storage/src/test/java/com/google/cloud/storage/ITFastOpenFakeTest.java
index cf7df5384127..9300cbc25734 100644
--- a/java-storage/google-cloud-storage/src/test/java/com/google/cloud/storage/ITFastOpenFakeTest.java
+++ b/java-storage/google-cloud-storage/src/test/java/com/google/cloud/storage/ITFastOpenFakeTest.java
@@ -268,6 +268,24 @@ public void readSession_withMoreThanOneFastOpenConfig_isRejected() throws Except
     assertThat(requestsReceived).isEmpty();
   }
 
+  @Test
+  public void readSession_withASeekableChannelConfig_isRejected() throws Exception {
+    FakeStorage server = fakeServer(ImmutableMap.of());
+
+    try (FakeServer fakeServer = FakeServer.of(server);
+        Storage storage = fakeServer.getGrpcStorageOptions().getService()) {
+      StorageDataClient dataClient = maybeGetStorageDataClient(storage);
+
+      assertThrows(
+          IllegalArgumentException.class,
+          () ->
+              dataClient.readSession(
+                  OPEN, CTX, ImmutableList.of(ReadProjectionConfigs.asSeekableChannel())));
+    }
+
+    assertThat(requestsReceived).isEmpty();
+  }
+
   /**
    * A fake server that answers each request in {@code responses} and adds it to {@link
    * #requestsReceived}. Any other request is answered with an error.