diff --git a/contrib/import-checker.py b/contrib/import-checker.py
--- a/contrib/import-checker.py
+++ b/contrib/import-checker.py
@@ -260,9 +260,9 @@
                 break
         else:
             stdlib_prefixes.add(dirname)
-    for libpath in sys.path:
-        # We want to walk everything in sys.path that starts with
-        # something in stdlib_prefixes.
+    for libpath in sys.path[1:]:
+        # We want to walk everything in sys.path (other than the directory of
+        # the current script) that starts with something in stdlib_prefixes.
         if not any(libpath.startswith(p) for p in stdlib_prefixes):
             continue
         for top, dirs, files in os.walk(libpath):