diff --git a/setup.py b/setup.py
index f0d3ab3..ebb1b4f 100644
--- a/setup.py
+++ b/setup.py
@@ -177,6 +177,7 @@ 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),
             '--enable-experimental',