diff --git a/src/main/kotlin/app/revanced/patches/all/telephony/sim/spoof/SpoofSimCountryPatch.kt b/src/main/kotlin/app/revanced/patches/all/telephony/sim/spoof/SpoofSimCountryPatch.kt
index 3f118f9c7..068861b02 100644
--- a/src/main/kotlin/app/revanced/patches/all/telephony/sim/spoof/SpoofSimCountryPatch.kt
+++ b/src/main/kotlin/app/revanced/patches/all/telephony/sim/spoof/SpoofSimCountryPatch.kt
@@ -46,7 +46,7 @@ object SpoofSimCountryPatch : AbstractTransformInstructionsPatch<Pair<Int, Strin
         title,
         "ISO-3166-1 alpha-2 country code equivalent for the SIM provider's country code.",
         false,
-        validator = { it: String? -> it?.uppercase() in countries.keys || it == null }
+        validator = { it: String? -> it == null || it.uppercase() in countries.values }
     )
 
     override fun filterMap(