diff --git a/configure.ac b/configure.ac
index c7eac4ae3e60d5a5f6d03cadc4d5ebe1595211f6..65430bf0b62f0706d0c466dd96e1153e7f1e7337 100644
--- a/configure.ac
+++ b/configure.ac
@@ -241,7 +241,7 @@ AC_SUBST(SOLARIS_BROKEN_SHLD)
 
 dnl ** Do an unregisterised build?
 dnl --------------------------------------------------------------
-case "$HostArch" in
+case "$TargetArch" in
     i386|x86_64|powerpc|powerpc64|powerpc64le|arm)
         UnregisterisedDefault=NO
         ;;