diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index de8d3d3fa651..b4d23b3a2ef2 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -326,7 +326,10 @@ void acpi_set_irq_model(enum acpi_irq_model_id model,
 #ifdef CONFIG_X86_IO_APIC
 extern int acpi_get_override_irq(u32 gsi, int *trigger, int *polarity);
 #else
-#define acpi_get_override_irq(gsi, trigger, polarity) (-1)
+static inline int acpi_get_override_irq(u32 gsi, int *trigger, int *polarity)
+{
+	return -1;
+}
 #endif
 /*
  * This function undoes the effect of one call to acpi_register_gsi().