diff --git a/configure.ac b/configure.ac
index ad96a2d1e1..943eaf5fa5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1871,7 +1871,7 @@ echo "  gprof enabled       = $enable_gprof"
 echo "  werror              = $enable_werror"
 echo
 echo "  target os           = $TARGET_OS"
-echo "  build os            = $BUILD_OS"
+echo "  build os            = $build_os"
 echo
 echo "  CC                  = $CC"
 echo "  CFLAGS              = $PTHREAD_CFLAGS $CFLAGS"