diff --git a/lib/dynbuf.h b/lib/dynbuf.h
index fedc81117c..71b0cc239d 100644
--- a/lib/dynbuf.h
+++ b/lib/dynbuf.h
@@ -97,5 +97,5 @@ char *Curl_dyn_take(struct dynbuf *s, size_t *plen);
 #define DYN_PINGPPONG_CMD   (64*1024)
 #define DYN_IMAP_CMD        (64*1024)
 #define DYN_MQTT_RECV       (64*1024)
-#define DYN_CRLFILE_SIZE    8000000
+#define DYN_CRLFILE_SIZE    (400*1024*1024) /* 400mb */
 #endif