diff --git a/compiler-rt/test/lit.common.cfg.py b/compiler-rt/test/lit.common.cfg.py
index ea22fb0babc46..d18400e875779 100644
--- a/compiler-rt/test/lit.common.cfg.py
+++ b/compiler-rt/test/lit.common.cfg.py
@@ -970,6 +970,7 @@ def target_page_size():
             shell=True,
             stdin=subprocess.PIPE,
             stdout=subprocess.PIPE,
+            stderr=subprocess.PIPE,
         )
         out, err = proc.communicate(b'import os; print(os.sysconf("SC_PAGESIZE"))')
         return int(out)