diff --git a/psutil/tests/__init__.py b/psutil/tests/__init__.py
index 163f76118..e2277d54a 100644
--- a/psutil/tests/__init__.py
+++ b/psutil/tests/__init__.py
@@ -129,8 +129,7 @@
 CI_TESTING = APPVEYOR or GITHUB_ACTIONS
 COVERAGE = 'COVERAGE_RUN' in os.environ
 if LINUX:
-    with open('/proc/self/cmdline') as f:
-        QEMU_USER = "/bin/qemu-" in f.read()
+    QEMU_USER = "/bin/qemu-" in psutil.Process().cmdline()[0]
 else:
     QEMU_USER = False
 # are we a 64 bit process?