diff --git a/sys/i386/include/acpica_machdep.h b/sys/i386/include/acpica_machdep.h
index a59cfe1c0fa4..6ff98d8ba724 100644
--- a/sys/i386/include/acpica_machdep.h
+++ b/sys/i386/include/acpica_machdep.h
@@ -120,4 +120,6 @@
 #define COMPILER_DEPENDENT_UINT64      unsigned long long
 #define ACPI_USE_NATIVE_DIVIDE
 
+void    acpi_SetDefaultIntrModel(int model);
+
 #endif /* __ACPICA_MACHDEP_H__ */