diff --git a/tests/periph_i2c/main.c b/tests/periph_i2c/main.c
index 8413d876f6..714be61ffc 100644
--- a/tests/periph_i2c/main.c
+++ b/tests/periph_i2c/main.c
@@ -319,9 +319,9 @@ int main(void)
     /* prepare I/O for shell */
     board_uart0_init();
     (void) posix_open(uart0_handler_pid, 0);
-    shell_init(&shell, NULL, UART0_BUFSIZE, uart0_readc, uart0_putc);
+    shell_init(&shell, shell_commands, UART0_BUFSIZE, uart0_readc, uart0_putc);
 #else
-    shell_init(&shell, NULL, UART0_BUFSIZE, getchar, putchar);
+    shell_init(&shell, shell_commands, UART0_BUFSIZE, getchar, putchar);
 #endif
 
     /* define own shell commands */