diff --git a/pyperf/_system.py b/pyperf/_system.py
index e634a974..b5833707 100644
--- a/pyperf/_system.py
+++ b/pyperf/_system.py
@@ -129,7 +129,7 @@ def available():
         return (
             OS_LINUX and 
             not use_intel_pstate() and 
-            platform.machine() not in ('x86', 'x86_64', 'amd64')
+            platform.machine() in ('x86', 'x86_64', 'amd64')
         )
 
     def __init__(self, system):