1 files changed, 9 insertions, 2 deletions

diff --git a/sys/contrib/dev/acpica/acfreebsd.h b/sys/contrib/dev/acpica/acfreebsd.h
index 9edbe390dbd1..6c7b0662957b 100644
--- a/sys/contrib/dev/acpica/acfreebsd.h
+++ b/sys/contrib/dev/acpica/acfreebsd.h
@@ -119,10 +119,17 @@
 
 /*
  * Some systems' ASL may have problems because they look for names 
- * of Microsoft operating systems.  To override this, set hw.acpi.os_name
- * to the appropriate string.
+ * of Microsoft operating systems.  We default to "Microsoft Windows NT"
+ * (aka NT5 or Windows 2000) because it is most similar to our
+ * implementation and also most prevalent.
+ *
+ * To override this, set hw.acpi.os_name to the appropriate string.
  */
+#ifndef ACPICA_PEDANTIC
+#define ACPI_OS_NAME                "Microsoft Windows NT"
+#else
 #define ACPI_OS_NAME                "FreeBSD"
+#endif
 
 /* FreeBSD uses GCC */