diff --git a/_setup.py b/_setup.py
index 1a8b9e024..f99e9e7dc 100644
--- a/_setup.py
+++ b/_setup.py
@@ -130,7 +130,11 @@ if "--no_ext" in sys.argv or os.environ.get("NO_EXT"):
     except ValueError:
         pass
     ext_modules = []
-elif sys.platform.startswith("java") or sys.platform == "cli" or "PyPy" in sys.version:
+elif (
+    sys.platform.startswith("java")
+    or sys.platform == "cli"
+    or sys.implementation.name in ("pypy", "graalpy")
+):
     sys.stdout.write(
         """
 *****************************************************\n