@@ -97,11 +97,11 @@
  * 	       string starts with 0, base 8 is assumed. Otherwise, base 10 is
  * 	       assumed.
  * @return The contents of the receiver as a `long long` value in the specified
  *	   base
  */
-- (long long)longLongValueWithBase: (int)base;
+- (long long)longLongValueWithBase: (unsigned char)base;
 
 /**
  * @brief The contents of the receiver as an `unsigned long long` value in the
  *	  specified base.
  *
@@ -110,9 +110,9 @@
  * 	       string starts with 0, base 8 is assumed. Otherwise, base 10 is
  * 	       assumed.
  * @return The contents of the receiver as an `unsigned long long` value in the
  * 	   specified base
  */
-- (unsigned long long)unsignedLongLongValueWithBase: (int)base;
+- (unsigned long long)unsignedLongLongValueWithBase: (unsigned char)base;
 @end
 
 OF_ASSUME_NONNULL_END