diff --git a/cpu/cc253x/dev/uart0.c b/cpu/cc253x/dev/uart0.c
index 0e8ddb1d1..a6a358a18 100644
--- a/cpu/cc253x/dev/uart0.c
+++ b/cpu/cc253x/dev/uart0.c
@@ -27,7 +27,7 @@ uart0_init()
 #endif
 
 #ifdef UART0_ALTERNATIVE_2
-  PERCFG |= PERCFG_U0CFG;  / *alternative port 2 = P1.5-2 */
+  PERCFG |= PERCFG_U0CFG;  /* alternative port 2 = P1.5-2 */
 #ifdef UART0_RTSCTS
   P1SEL |= 0x3C;    /* peripheral select for TX and RX, RTS, CTS */
 #else