diff --git a/src/lib.rs b/src/lib.rs
index 65ac39d..ba66903 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -106,7 +106,14 @@ impl Config {
                                 return Err(ConfigError::InvalidGamma(value.to_string()));
                             }
                         }
-                        "night" => config.gamma_night = value.parse()?,
+                        "night" => {
+                            let parsed = value.parse::<u16>()?;
+                            if parsed <= 100 {
+                                config.gamma_night = parsed
+                            } else {
+                                return Err(ConfigError::InvalidGamma(value.to_string()));
+                            }
+                        }
                         _ => {}
                     },
                     "temp" => match key_trimmed {