diff --git a/GreenshotPlugin/Core/CoreConfiguration.cs b/GreenshotPlugin/Core/CoreConfiguration.cs
index 80da500dd..8997ac7cf 100644
--- a/GreenshotPlugin/Core/CoreConfiguration.cs
+++ b/GreenshotPlugin/Core/CoreConfiguration.cs
@@ -413,6 +413,12 @@ namespace GreenshotPlugin.Core {
 			if (AutoCropDifference > 255) {
 				AutoCropDifference = 255;
 			}
+			if (OutputFileReduceColorsTo < 0) {
+				OutputFileReduceColorsTo = 0;
+			}
+			if (OutputFileReduceColorsTo > 256) {
+				OutputFileReduceColorsTo = 256;
+			}
 		}
 	}
 }
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