diff --git a/quic/interop/src/main/kotlin/com/vitorpamplona/quic/interop/runner/HqInteropGetClient.kt b/quic/interop/src/main/kotlin/com/vitorpamplona/quic/interop/runner/HqInteropGetClient.kt
index 74e143adc..027bf73bc 100644
--- a/quic/interop/src/main/kotlin/com/vitorpamplona/quic/interop/runner/HqInteropGetClient.kt
+++ b/quic/interop/src/main/kotlin/com/vitorpamplona/quic/interop/runner/HqInteropGetClient.kt
@@ -39,7 +39,7 @@ import kotlinx.coroutines.flow.toList
  */
 class HqInteropGetClient(
     private val conn: QuicConnection,
-    @Suppress("UNUSED_PARAMETER") private val driver: QuicConnectionDriver,
+    private val driver: QuicConnectionDriver,
 ) : GetClient {
     override suspend fun prepareRequest(
         @Suppress("UNUSED_PARAMETER") authority: String,
@@ -49,6 +49,8 @@ class HqInteropGetClient(
         val request = "GET $path\r\n".encodeToByteArray()
         stream.send.enqueue(request)
         stream.send.finish()
+        // Wake the send loop — same reasoning as Http3GetClient.
+        driver.wakeup()
         return HqRequestHandle(stream)
     }
 
diff --git a/quic/interop/src/main/kotlin/com/vitorpamplona/quic/interop/runner/Http3GetClient.kt b/quic/interop/src/main/kotlin/com/vitorpamplona/quic/interop/runner/Http3GetClient.kt
index a3dc638b8..c1a20bed5 100644
--- a/quic/interop/src/main/kotlin/com/vitorpamplona/quic/interop/runner/Http3GetClient.kt
+++ b/quic/interop/src/main/kotlin/com/vitorpamplona/quic/interop/runner/Http3GetClient.kt
@@ -151,6 +151,13 @@ class Http3GetClient(
         val stream = conn.openBidiStream()
         stream.send.enqueue(encodeRequest(authority, path))
         stream.send.finish()
+        // Without this, the data sits in the queue until the PTO
+        // timer fires (~1 s later). On the longrtt scenario (750 ms
+        // one-way, 1.5 s RTT) that's a fatal delay — the runner's
+        // 8 s timeout doesn't leave room for the PTO + RTT + RTT
+        // dance. The parallel path wakes after the chunk; the
+        // serial path was missing the same nudge.
+        driver.wakeup()
         return Http3RequestHandle(stream)
     }