diff --git a/firmware/ec/test/suites/Test_OcGpio.c b/firmware/ec/test/suites/Test_OcGpio.c
index c4678d2790..3ff06b0012 100644
--- a/firmware/ec/test/suites/Test_OcGpio.c
+++ b/firmware/ec/test/suites/Test_OcGpio.c
@@ -51,27 +51,27 @@ void suite_tearDown(void)
 {
 }
 
-void test_ocgpio_init()
+void test_ocgpio_init(void)
 {
     TEST_ASSERT_EQUAL(OCGPIO_SUCCESS, OcGpio_init(&s_fake_io_port));
 }
 
-void test_ocgpio_read()
+void test_ocgpio_read(void)
 {
     OcGpio_GpioPins[1] = 1;
     TEST_ASSERT_EQUAL(1, OcGpio_read(&s_fake_pin));
 }
 
-void test_ocgpio_write()
+void test_ocgpio_write(void)
 {
     OcGpio_GpioPins[1] = 1;
     TEST_ASSERT_EQUAL(OCGPIO_SUCCESS, OcGpio_write(&s_fake_pin, 0));
     TEST_ASSERT_EQUAL(0, OcGpio_GpioPins[1]);
 }
 
-void test_ocgpio_configure()
+void test_ocgpio_configure(void)
 {
     OcGpio_GpioPins[1] = 1;
     TEST_ASSERT_EQUAL(OCGPIO_SUCCESS, OcGpio_configure(&s_fake_pin, 8));
     TEST_ASSERT_EQUAL(8, OcGpio_GpioConfig[1]);
-}
\ No newline at end of file
+}