diff --git a/config.guess b/config.guess
index 93b974da4c..f840201417 100755
--- a/config.guess
+++ b/config.guess
@@ -120,6 +120,9 @@ case "${UNAME_MACHINE}:${UNAME_SYSTEM}:${UNAME_RELEASE}:${UNAME_VERSION}" in
     mips:*:5*:RISCos)
 	echo mips-mips-riscos${UNAME_RELEASE}
 	exit 0 ;;
+    Night_Hawk:Power_UNIX:*:*)
+	echo powerpc-harris-powerunix
+	exit 0 ;;
     m88k:CX/UX:7*:*)
 	echo m88k-harris-cxux7
 	exit 0 ;;