diff --git a/mfbt/WindowsVersion.h b/mfbt/WindowsVersion.h
index a429a777c1b22..449e223015e6a 100644
--- a/mfbt/WindowsVersion.h
+++ b/mfbt/WindowsVersion.h
@@ -167,7 +167,7 @@ MOZ_ALWAYS_INLINE bool IsWin11OrLater() {
 }
 
 MOZ_ALWAYS_INLINE bool IsNotWin7PreRTM() {
-  return IsWin7SP1OrLater() || IsWindowsBuildOrLater(7600);
+  return IsWin7SP1OrLater() || IsWindowsBuildOrLater(6002);
 }
 
 inline bool IsWin7AndPre2000Compatible() {