diff --git a/python/setup.py b/python/setup.py
index 88119e2d2aa..504c78d61bb 100755
--- a/python/setup.py
+++ b/python/setup.py
@@ -44,7 +44,7 @@
 # as here it may be set to the host not target platform
 is_emscripten = (
     sysconfig.get_config_var("SOABI")
-    and sysconfig.get_config_var("SOABI").find("emscripten") != -1
+    and sysconfig.get_config_var("SOABI").find("emscripten") != -1  # type: ignore[possibly-unbound]
 )
 
 
@@ -254,7 +254,7 @@ def _run_cmake(self):
             if os.path.isfile('CMakeCache.txt'):
                 cachefile = open('CMakeCache.txt', 'r')
                 cachedir = re.search('CMAKE_CACHEFILE_DIR:INTERNAL=(.*)',
-                                     cachefile.read()).group(1)
+                                     cachefile.read()).group(1)  # type: ignore[possibly-unbound-attribute]
                 cachefile.close()
                 if (cachedir != build_temp):
                     build_base = pjoin(saved_cwd, build_cmd.build_base)