diff --git a/drivers/platform/x86/apple-gmux.c b/drivers/platform/x86/apple-gmux.c
index 7c4eb86c851e..fd2ffebc868f 100644
--- a/drivers/platform/x86/apple-gmux.c
+++ b/drivers/platform/x86/apple-gmux.c
@@ -495,7 +495,7 @@ static int gmux_set_power_state(enum vga_switcheroo_client_id id,
 	return gmux_set_discrete_state(apple_gmux_data, state);
 }
 
-static int gmux_get_client_id(struct pci_dev *pdev)
+static enum vga_switcheroo_client_id gmux_get_client_id(struct pci_dev *pdev)
 {
 	/*
 	 * Early Macbook Pros with switchable graphics use nvidia