diff --git a/setup.py b/setup.py
index 207e466c4..937d3f58d 100755
--- a/setup.py
+++ b/setup.py
@@ -72,7 +72,7 @@ def init_env(debug=False, asan=False):
             ver = subprocess.check_output('pkg-config --modversion glew'.split()).decode('utf-8').strip()
         except Exception:
             ver = 'not found'
-        major = int(re.match(r'\d+', ver))
+        major = int(re.match(r'\d+', ver).group())
         if major < 2:
             raise SystemExit('glew >= 2.0.0 is required, found version: ' + ver)
     cflags.extend(pkg_config('glew', '--cflags-only-I'))