diff --git a/core/src/com/unciv/models/ruleset/tile/TileImprovement.kt b/core/src/com/unciv/models/ruleset/tile/TileImprovement.kt
index db5ab75d30..b34ce6f349 100644
--- a/core/src/com/unciv/models/ruleset/tile/TileImprovement.kt
+++ b/core/src/com/unciv/models/ruleset/tile/TileImprovement.kt
@@ -83,6 +83,7 @@ class TileImprovement : RulesetStatsObject() {
             "All" -> true
             "All Road" -> isRoad()
             "Great Improvement", "Great" -> isGreatImprovement()
+            in uniques -> true
             else -> false
         }
     }
diff --git a/core/src/com/unciv/models/ruleset/unique/UniqueParameterType.kt b/core/src/com/unciv/models/ruleset/unique/UniqueParameterType.kt
index 5506cee61a..61052409ce 100644
--- a/core/src/com/unciv/models/ruleset/unique/UniqueParameterType.kt
+++ b/core/src/com/unciv/models/ruleset/unique/UniqueParameterType.kt
@@ -341,7 +341,9 @@ enum class UniqueParameterType(
         override fun getErrorSeverity(parameterText: String, ruleset: Ruleset):
                 UniqueType.UniqueComplianceErrorSeverity? {
             if (parameterText in knownValues) return null
-            return ImprovementName.getErrorSeverity(parameterText, ruleset)
+            if (ImprovementName.getErrorSeverity(parameterText, ruleset) == null) return null
+            if (ruleset.tileImprovements.values.any { it.hasUnique(parameterText) }) return null
+            return UniqueType.UniqueComplianceErrorSeverity.RulesetSpecific
         }
         override fun isTranslationWriterGuess(parameterText: String, ruleset: Ruleset) =
             parameterText != "All" && getErrorSeverity(parameterText, ruleset) == null