diff --git a/src/common/io/io_unix.c b/src/common/io/io_unix.c
index edd740ba5..62c25dc59 100644
--- a/src/common/io/io_unix.c
+++ b/src/common/io/io_unix.c
@@ -144,7 +144,7 @@ const char* ffGetTerminalResponse(const char* request, const char* format, ...)
 {
     if (ftty < 0)
     {
-        ftty = open("/dev/tty", O_RDWR | O_NOCTTY | O_CLOEXEC | O_NONBLOCK);
+        ftty = open("/dev/tty", O_RDWR | O_NOCTTY | O_CLOEXEC);
         if (ftty < 0)
             return "open(\"/dev/tty\", O_RDWR | O_NOCTTY | O_CLOEXEC) failed";