diff --git a/src/exec_pty.c b/src/exec_pty.c
index 504657a9e..1302aaef6 100644
--- a/src/exec_pty.c
+++ b/src/exec_pty.c
@@ -85,7 +85,7 @@ struct io_buffer {
     int rfd;  /* reader (producer) */
     int wfd; /* writer (consumer) */
     bool (*action)(const char *buf, unsigned int len);
-    char buf[16 * 1024];
+    char buf[32 * 1024];
 };
 
 static char slavename[PATH_MAX];