diff --git a/cpu/msp430/dev/uart0-putchar.c b/cpu/msp430/dev/uart0-putchar.c
index 819f627d2..96f24abf0 100644
--- a/cpu/msp430/dev/uart0-putchar.c
+++ b/cpu/msp430/dev/uart0-putchar.c
@@ -1,9 +1,11 @@
 #include "dev/uart0.h"
-#include <stdio.h>
 
+#if !NETSTACK_CONF_WITH_IPV4
+/* In case of IPv4: putchar() is defined by the SLIP driver */
 int
 putchar(int c)
 {
   uart0_writeb((char)c);
   return c;
 }
+#endif /* ! NETSTACK_CONF_WITH_IPV4 */
diff --git a/cpu/msp430/dev/uart1-putchar.c b/cpu/msp430/dev/uart1-putchar.c
index 3d7f65c7b..5cb631190 100644
--- a/cpu/msp430/dev/uart1-putchar.c
+++ b/cpu/msp430/dev/uart1-putchar.c
@@ -1,9 +1,11 @@
-#include <stdio.h>
 #include "dev/uart1.h"
 
+#if !NETSTACK_CONF_WITH_IPV4
+/* In case of IPv4: putchar() is defined by the SLIP driver */
 int
 putchar(int c)
 {
   uart1_writeb((char)c);
   return c;
 }
+#endif /* ! NETSTACK_CONF_WITH_IPV4 */