diff --git a/include/ctre/atoms_characters.hpp b/include/ctre/atoms_characters.hpp
index 349718db..d7000674 100644
--- a/include/ctre/atoms_characters.hpp
+++ b/include/ctre/atoms_characters.hpp
@@ -40,7 +40,7 @@ template <auto V> struct character {
 				}
 			}	
 		}
-		return value == V;
+		return (std::make_unsigned_t<CharT>)value == V;
 	}
 };
 
@@ -79,7 +79,7 @@ template <auto A, auto B> struct char_range {
 				}
 			}	
 		}
-		return (value >= A) && (value <= B);
+		return ((std::make_unsigned_t<CharT>)value >= A) && ((std::make_unsigned_t<CharT>)value <= B);
 	}
 };
 using word_chars = set<char_range<'A','Z'>, char_range<'a','z'>, char_range<'0','9'>, character<'_'> >;