diff --git a/setupext.py b/setupext.py
index 4e29476a1b0e..60538cd0ebfe 100644
--- a/setupext.py
+++ b/setupext.py
@@ -1337,6 +1337,8 @@ def add_flags(self, ext):
         else:
             ext.include_dirs.insert(0, 'extern')
             ext.sources.extend(sorted(glob.glob('extern/libqhull/*.c')))
+            if sysconfig.get_config_var('LIBM') == '-lm':
+                ext.libraries.extend('m')
 
 
 class TTConv(SetupPackage):