diff --git a/arch/sim/src/sim/up_simuart.c b/arch/sim/src/sim/up_simuart.c
index 7d89e46217..366dd4b154 100644
--- a/arch/sim/src/sim/up_simuart.c
+++ b/arch/sim/src/sim/up_simuart.c
@@ -70,7 +70,6 @@ static void setrawmode(int fd)
 
   raw.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR |
                    ICRNL | IXON);
-  raw.c_oflag &= ~OPOST;
   raw.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
   raw.c_cflag &= ~(CSIZE | PARENB);
   raw.c_cflag |= CS8;