diff --git a/css/properties/background-size.json b/css/properties/background-size.json
index 346400057aaa39..1e5de907bbeea4 100644
--- a/css/properties/background-size.json
+++ b/css/properties/background-size.json
@@ -138,7 +138,7 @@
               },
               "firefox_android": "mirror",
               "ie": {
-                "version_added": "9"
+                "version_added": "≤11"
               },
               "oculus": "mirror",
               "opera": "mirror",