diff --git a/pkgs/by-name/xp/xpilot-ng/package.nix b/pkgs/by-name/xp/xpilot-ng/package.nix
index 9bb85d4d2dc4..1b5513763f13 100644
--- a/pkgs/by-name/xp/xpilot-ng/package.nix
+++ b/pkgs/by-name/xp/xpilot-ng/package.nix
@@ -12,7 +12,7 @@
   SDL_ttf,
   SDL_image,
   zlib,
-  libXxf86misc,
+  libxxf86misc,
 }:
 stdenv.mkDerivation (finalAttrs: {
   pname = "xpilot-ng";
@@ -32,7 +32,7 @@ stdenv.mkDerivation (finalAttrs: {
     libGL
     expat
     zlib
-    libXxf86misc
+    libxxf86misc
   ];
 
   patches = [
diff --git a/pkgs/development/libraries/allegro/5.nix b/pkgs/development/libraries/allegro/5.nix
index bb19e3322a40..49b12cb3223c 100644
--- a/pkgs/development/libraries/allegro/5.nix
+++ b/pkgs/development/libraries/allegro/5.nix
@@ -28,7 +28,7 @@
   libxpm,
   libxt,
   libxxf86dga,
-  libXxf86misc,
+  libxxf86misc,
   libXxf86vm,
   openal,
   physfs,
@@ -101,7 +101,7 @@ stdenv.mkDerivation rec {
     libxpm
     libxt
     libxxf86dga
-    libXxf86misc
+    libxxf86misc
     libXxf86vm
     xorgproto
   ]
diff --git a/pkgs/development/libraries/allegro/default.nix b/pkgs/development/libraries/allegro/default.nix
index f9afff90fa2d..cf4444d2bc47 100644
--- a/pkgs/development/libraries/allegro/default.nix
+++ b/pkgs/development/libraries/allegro/default.nix
@@ -16,7 +16,7 @@
   libpng,
   libvorbis,
   libxxf86dga,
-  libXxf86misc,
+  libxxf86misc,
   libXxf86vm,
   openal,
   libGLU,
@@ -54,7 +54,7 @@ stdenv.mkDerivation rec {
     libpng
     libvorbis
     libxxf86dga
-    libXxf86misc
+    libxxf86misc
     libXxf86vm
     openal
     libGLU