diff --git a/test/litest-synaptics-st.c b/test/litest-synaptics-st.c
index 4e2ee563..e18d2b2c 100644
--- a/test/litest-synaptics-st.c
+++ b/test/litest-synaptics-st.c
@@ -28,7 +28,8 @@
 #include "litest-int.h"
 #include "libinput-util.h"
 
-void litest_synaptics_touchpad_setup(void)
+static void
+litest_synaptics_touchpad_setup(void)
 {
 	struct litest_device *d = litest_create_device(LITEST_SYNAPTICS_TOUCHPAD);
 	litest_set_current_device(d);
diff --git a/test/litest-synaptics.c b/test/litest-synaptics.c
index efa862b2..e7ebbb63 100644
--- a/test/litest-synaptics.c
+++ b/test/litest-synaptics.c
@@ -28,7 +28,8 @@
 #include "litest-int.h"
 #include "libinput-util.h"
 
-void litest_synaptics_clickpad_setup(void)
+static void
+litest_synaptics_clickpad_setup(void)
 {
 	struct litest_device *d = litest_create_device(LITEST_SYNAPTICS_CLICKPAD);
 	litest_set_current_device(d);
diff --git a/test/litest-wacom-touch.c b/test/litest-wacom-touch.c
index b3118824..a5da17ff 100644
--- a/test/litest-wacom-touch.c
+++ b/test/litest-wacom-touch.c
@@ -28,7 +28,8 @@
 #include "litest-int.h"
 #include "libinput-util.h"
 
-void litest_wacom_touch_setup(void)
+static void
+litest_wacom_touch_setup(void)
 {
 	struct litest_device *d = litest_create_device(LITEST_WACOM_TOUCH);
 	litest_set_current_device(d);