diff --git a/pkgs/development/libraries/allegro/default.nix b/pkgs/development/libraries/allegro/default.nix
index 6071f63255d..c7534134397 100644
--- a/pkgs/development/libraries/allegro/default.nix
+++ b/pkgs/development/libraries/allegro/default.nix
@@ -14,6 +14,7 @@ stdenv.mkDerivation rec {
 
   patches = [
     ./nix-unstable-sandbox-fix.patch
+    ./encoding.patch
   ];
 
   buildInputs = [
diff --git a/pkgs/development/libraries/allegro/encoding.patch b/pkgs/development/libraries/allegro/encoding.patch
new file mode 100644
index 00000000000..1dca9475280
--- /dev/null
+++ b/pkgs/development/libraries/allegro/encoding.patch
@@ -0,0 +1,10 @@
+--- allegro-4.4.3/docs/src/allegro._tx.orig     2019-02-02 20:28:46.000000000 +0100
++++ allegro-4.4.3/docs/src/allegro._tx  2019-11-04 11:12:39.352699777 +0100
+@@ -23,6 +23,7 @@
+ @man_shortdesc_force1=allegro
+ @man_shortdesc_force2=Allegro game programming library.
+ @$\input texinfo
++@$@documentencoding ISO-8859-1
+ @$@setfilename allegro.inf
+ @$@settitle Allegro Manual
+ @$@setchapternewpage odd
\ No newline at end of file