diff --git a/src/main.d b/src/main.d
index 2eddf43..7708002 100644
--- a/src/main.d
+++ b/src/main.d
@@ -89,7 +89,7 @@ int main (string[] parArgs) {
 		writefln("%s home page: <%s>", BACKEND_NAME, BACKEND_WEBSITE);
 	}
 	else if (show_version) {
-		writefln("%s %d.%d Copyright © %d  Michele \"King_DuckZ\" Santullo", PROGRAM_NAME, TIGERSUM_VERSION_MAJOR, TIGERSUM_VERSION_MINOR, COPYRIGHT_YEAR);
+		writefln("%s %d.%d Copyright © %s  Michele \"King_DuckZ\" Santullo", PROGRAM_NAME, TIGERSUM_VERSION_MAJOR, TIGERSUM_VERSION_MINOR, COPYRIGHT_YEAR);
 		writefln("Using the %s implementation by %s", BACKEND_NAME, BACKEND_AUTHOR);
 		writeln(BACKEND_WEBSITE);
 		writeln();
@@ -99,7 +99,7 @@ int main (string[] parArgs) {
 	}
 	else if (show_license) {
 		writefln("%s - a command line utility to calculate the tiger hash from input.", PROGRAM_NAME);
-		writefln("Copyright © %d  Michele \"King_DuckZ\" Santullo", COPYRIGHT_YEAR);
+		writefln("Copyright © %s  Michele \"King_DuckZ\" Santullo", COPYRIGHT_YEAR);
 		writeln();
 		writefln("%s is free software: you can redistribute it and/or modify", PROGRAM_NAME);
 		writeln("it under the terms of the GNU General Public License as published by");
diff --git a/src/tigersumConfig.d.in b/src/tigersumConfig.d.in
index 816aae2..48f349f 100644
--- a/src/tigersumConfig.d.in
+++ b/src/tigersumConfig.d.in
@@ -1,7 +1,7 @@
 const ushort TIGER_VERSION_DEF = @DEFAULT_TIGER_VERSION@;
 const ushort TIGERSUM_VERSION_MAJOR = @TIGERSUM_MAJOR@;
 const ushort TIGERSUM_VERSION_MINOR = @TIGERSUM_MINOR@;
-const ushort COPYRIGHT_YEAR = 2014;
+const string COPYRIGHT_YEAR = "2014-2021";
 const string PROGRAM_NAME = "@PROJECT_NAME@";
 const string BACKEND_WEBSITE = "@BACKEND_WEBSITE@";
 const string BACKEND_NAME = "@BACKEND_NAME@";