diff --git a/app/src/main.c b/app/src/main.c
index 3fd6b116..9bd7af32 100644
--- a/app/src/main.c
+++ b/app/src/main.c
@@ -17,14 +17,16 @@ LOG_MODULE_REGISTER(zmk, CONFIG_ZMK_LOG_LEVEL);
 #include <zmk/display.h>
 #include <drivers/ext_power.h>
 
-void main(void) {
+int main(void) {
     LOG_INF("Welcome to ZMK!\n");
 
     if (zmk_kscan_init(DEVICE_DT_GET(ZMK_MATRIX_NODE_ID)) != 0) {
-        return;
+        return -ENOTSUP;
     }
 
 #ifdef CONFIG_ZMK_DISPLAY
     zmk_display_init();
 #endif /* CONFIG_ZMK_DISPLAY */
+
+    return 0;
 }