diff --git a/arch/cpu/cc2538/slip-arch.c b/arch/cpu/cc2538/slip-arch.c
index 9d8b7701c..58aec9f84 100644
--- a/arch/cpu/cc2538/slip-arch.c
+++ b/arch/cpu/cc2538/slip-arch.c
@@ -74,10 +74,9 @@ slip_arch_writeb(unsigned char c)
 /*---------------------------------------------------------------------------*/
 /**
  * \brief Initialise the arch-specific SLIP driver
- * \param ubr Ignored for the cc2538
  */
 void
-slip_arch_init(unsigned long ubr)
+slip_arch_init()
 {
   set_input(slip_input_byte);
 }
diff --git a/arch/cpu/cc26xx-cc13xx/slip-arch.c b/arch/cpu/cc26xx-cc13xx/slip-arch.c
index c509b2547..6c6914363 100644
--- a/arch/cpu/cc26xx-cc13xx/slip-arch.c
+++ b/arch/cpu/cc26xx-cc13xx/slip-arch.c
@@ -53,10 +53,9 @@ slip_arch_writeb(unsigned char c)
 /*---------------------------------------------------------------------------*/
 /**
  * \brief Initialise the arch-specific SLIP driver
- * \param ubr Ignored for the cc26xx
  */
 void
-slip_arch_init(unsigned long ubr)
+slip_arch_init()
 {
   /*
    * Enable an input handler. In doing so, the driver will make sure that UART
diff --git a/arch/cpu/msp430/slip_uart0.c b/arch/cpu/msp430/slip_uart0.c
index 01952b862..174acf703 100644
--- a/arch/cpu/msp430/slip_uart0.c
+++ b/arch/cpu/msp430/slip_uart0.c
@@ -46,7 +46,7 @@ slip_arch_writeb(unsigned char c)
  *
  */
 void
-slip_arch_init(unsigned long ubr)
+slip_arch_init()
 {
   uart0_set_input(slip_input_byte);
 }
diff --git a/arch/cpu/msp430/slip_uart1.c b/arch/cpu/msp430/slip_uart1.c
index e28695d50..16cd11967 100644
--- a/arch/cpu/msp430/slip_uart1.c
+++ b/arch/cpu/msp430/slip_uart1.c
@@ -47,7 +47,7 @@ slip_arch_writeb(unsigned char c)
  *
  */
 void
-slip_arch_init(unsigned long ubr)
+slip_arch_init()
 {
   uart1_set_input(slip_input_byte);
 }
diff --git a/arch/platform/cooja/slip-arch.c b/arch/platform/cooja/slip-arch.c
index 959eeda47..74077db31 100644
--- a/arch/platform/cooja/slip-arch.c
+++ b/arch/platform/cooja/slip-arch.c
@@ -32,7 +32,7 @@
 #include "dev/rs232.h"
 
 void
-slip_arch_init(unsigned long ubr)
+slip_arch_init()
 {
   rs232_set_input(slip_input_byte);
 }
diff --git a/arch/platform/jn516x/dev/slip_uart0.c b/arch/platform/jn516x/dev/slip_uart0.c
index ac88acbe4..d29bc9b5f 100644
--- a/arch/platform/jn516x/dev/slip_uart0.c
+++ b/arch/platform/jn516x/dev/slip_uart0.c
@@ -47,7 +47,7 @@ slip_arch_writeb(unsigned char c)
  *
  */
 void
-slip_arch_init(unsigned long ubr)
+slip_arch_init()
 {
   uart0_set_input(slip_input_byte);
 }