diff --git a/apps/serial-shell/serial-shell.c b/apps/serial-shell/serial-shell.c
index d8ba9740b..b5a7515c3 100644
--- a/apps/serial-shell/serial-shell.c
+++ b/apps/serial-shell/serial-shell.c
@@ -67,7 +67,14 @@ shell_default_output(const char *text1, int len1, const char *text2, int len2)
     text2 = "";
     len2 = 0;
   }
-  printf("%.*s%.*s\r\n", len1, text1, len2, text2);
+
+  /* Workaround for absence of "%.*s" format in avr-libc */
+#if defined (__AVR__)
+  printf("%s%s\r\n", text1, text2);
+#else
+  *printf("%.*s%.*s\r\n", len1, text1, len2, text2);
+#endif
+
 }
 /*---------------------------------------------------------------------------*/
 void