diff --git a/setup.py b/setup.py
index bba4bce..b86b369 100644
--- a/setup.py
+++ b/setup.py
@@ -191,6 +192,7 @@ class build_clib(_build_clib):
             "--disable-dependency-tracking",
             "--with-pic",
             "--enable-module-recovery",
+            "--host=%s" % os.environ['TOOLCHAIN_PREFIX'],
             "--prefix",
             os.path.abspath(self.build_clib),
         ]
