diff --git a/libubb/swuart.c b/libubb/swuart.c
index 4ff81a6..da1b977 100644
--- a/libubb/swuart.c
+++ b/libubb/swuart.c
@@ -12,7 +12,6 @@
 
 
 #include <stdbool.h>
-#include <stdio.h>
 #include <string.h>
 #include <sys/mman.h>
 
@@ -238,10 +237,8 @@ int swuart_open(uint32_t tx, uint32_t rx, int bps)
 	 * Make sure code and rx/tx buffers are locked into memory before we
 	 * disable interrupts in swuart_trx.
 	 */
-	if (mlockall(MCL_CURRENT | MCL_FUTURE)) {
-		perror("mlockall");
+	if (mlockall(MCL_CURRENT | MCL_FUTURE))
 		return -1;
-	}
 
 	ticks = TCLK/bps-1;
 	tx_mask = tx;
@@ -257,6 +254,5 @@ int swuart_open(uint32_t tx, uint32_t rx, int bps)
 
 void swuart_close(void)
 {
-	if (munlockall())
-		perror("munlockall");
+	munlockall();
 }