diff --git a/src/e3/platform_db/knowledge_base.py b/src/e3/platform_db/knowledge_base.py
index eaa3d985..ea956c7e 100644
--- a/src/e3/platform_db/knowledge_base.py
+++ b/src/e3/platform_db/knowledge_base.py
@@ -176,6 +176,6 @@
     "x86_64-linux": {"os": "Linux", "cpu": "x86_64"},
     "sparc-solaris": {"os": "SunOS", "cpu": "sparc"},
     "x86-solaris": {"os": "SunOS", "cpu": "i386"},
-    "x86_64-windows64": {"os": "Windows", "cpu": "AMD64|amd64|x86_64"},
-    "x86-windows": {"os": "Windows", "cpu": None},
+    "x86_64-windows64": {"os": "Windows", "cpu": None},
+    "x86-windows": {"os": "Windows", "cpu": "i.86|pentium"},
 }