diff --git a/sys/contrib/dev/acpica/acdisasm.h b/sys/contrib/dev/acpica/acdisasm.h
index 8df05f9f55c8..801e6d6b6058 100644
--- a/sys/contrib/dev/acpica/acdisasm.h
+++ b/sys/contrib/dev/acpica/acdisasm.h
@@ -226,10 +226,6 @@ void
 AcpiDmDecodeInternalObject (
     ACPI_OPERAND_OBJECT     *ObjDesc);
 
-void
-AcpiDmDecodeNode (
-    ACPI_NAMESPACE_NODE     *Node);
-
 UINT32
 AcpiDmBlockType (
     ACPI_PARSE_OBJECT       *Op);