diff --git a/ebpftracer/l7/http2.go b/ebpftracer/l7/http2.go
index 79270a4..d9be66b 100644
--- a/ebpftracer/l7/http2.go
+++ b/ebpftracer/l7/http2.go
@@ -107,7 +107,13 @@ const (
 	// Max concurrent HTTP/2 streams tracked per connection.
 	// Prevents unbounded memory growth when responses never complete (orphan
 	// streams); at the limit the oldest stream makes way (evictOldestRequest).
-	maxActiveRequests = 100
+	// It must exceed what one connection legitimately carries: gRPC clients
+	// multiplex long-polls (workflow and job-queue workers' polls, which get
+	// no response headers until the poll returns, up to a minute later) by
+	// the hundred over one connection, and at 100 live polls were evicted.
+	// Orphans are still reclaimed by the stream GC (http2DecoderGcInterval);
+	// a request costs ~200 bytes, so a full table is ~200 KB.
+	maxActiveRequests = 1000
 )
 
 type Http2FrameHeader struct {