diff --git a/quic/platform/api/quic_ip_address.h b/quic/platform/api/quic_ip_address.h
index e1a1076..3585970 100644
--- a/quic/platform/api/quic_ip_address.h
+++ b/quic/platform/api/quic_ip_address.h
@@ -15,6 +15,7 @@
 #include <sys/types.h>
 #endif
 
+#include <ostream>
 #include <string>
 
 #include "net/third_party/quiche/src/quic/platform/api/quic_export.h"