1 files changed, 1 insertions, 1 deletions

diff --git a/arch/m32r/kernel/io_usrv.c b/arch/m32r/kernel/io_usrv.c
index 9eb161dcc104..39a379af40bc 100644
--- a/arch/m32r/kernel/io_usrv.c
+++ b/arch/m32r/kernel/io_usrv.c
@@ -47,7 +47,7 @@ static inline void *_port2addr(unsigned long port)
         else if (port >= UART1_IOSTART && port <= UART1_IOEND)
                 port = ((port - UART1_IOSTART) << 1) + UART1_REGSTART;
 #endif  /* CONFIG_SERIAL_8250 || CONFIG_SERIAL_8250_MODULE */
-        return (void *)(port + NONCACHE_OFFSET);
+        return (void *)(port | (NONCACHE_OFFSET));
 }
 
 static inline void delay(void)