diff --git a/Lib/test/libregrtest/main.py b/Lib/test/libregrtest/main.py
index 78b6790..2b6607d 100644
--- a/Lib/test/libregrtest/main.py
+++ b/Lib/test/libregrtest/main.py
@@ -215,8 +215,9 @@
 
         removepy(self.tests)
 
-        # add default PGO tests if no tests are specified
-        setup_pgo_tests(self.ns)
+        if self.ns.pgo:
+            # add default PGO tests if no tests are specified
+            setup_pgo_tests(self.ns)
 
         stdtests = STDTESTS[:]
         nottests = NOTTESTS.copy()