diff --git a/pkgs/by-name/wi/windowmaker/package.nix b/pkgs/by-name/wi/windowmaker/package.nix
index 706b21f4891e..3787e2d0c9e0 100644
--- a/pkgs/by-name/wi/windowmaker/package.nix
+++ b/pkgs/by-name/wi/windowmaker/package.nix
@@ -13,7 +13,7 @@
   libxmu,
   libxpm,
   libxrandr,
-  libXres,
+  libxres,
   libexif,
   libjpeg,
   libpng,
@@ -48,7 +48,7 @@ stdenv.mkDerivation (finalAttrs: {
     libxmu
     libxpm
     libxrandr
-    libXres
+    libxres
     libexif
     libjpeg
     libpng
diff --git a/pkgs/by-name/xw/xwayland/package.nix b/pkgs/by-name/xw/xwayland/package.nix
index 8f50575de852..3e37a145a37d 100644
--- a/pkgs/by-name/xw/xwayland/package.nix
+++ b/pkgs/by-name/xw/xwayland/package.nix
@@ -21,7 +21,7 @@
   libxmu,
   libxpm,
   libxrender,
-  libXres,
+  libxres,
   libXt,
   libdrm,
   libtirpc,
@@ -95,7 +95,7 @@ stdenv.mkDerivation rec {
     libxmu
     libxpm
     libxrender
-    libXres
+    libxres
     libXt
     libdrm
     libtirpc
diff --git a/pkgs/desktops/mate/marco/default.nix b/pkgs/desktops/mate/marco/default.nix
index 6da9d9ef87a1..296c681f6282 100644
--- a/pkgs/desktops/mate/marco/default.nix
+++ b/pkgs/desktops/mate/marco/default.nix
@@ -13,7 +13,7 @@
   libgtop,
   libxdamage,
   libxpresent,
-  libXres,
+  libxres,
   libstartup_notification,
   zenity,
   glib,
@@ -53,7 +53,7 @@ stdenv.mkDerivation (finalAttrs: {
     libgtop
     libxdamage
     libxpresent
-    libXres
+    libxres
     libstartup_notification
     gtk3
     zenity
diff --git a/pkgs/development/libraries/libwnck/default.nix b/pkgs/development/libraries/libwnck/default.nix
index 8a246a8ac033..dbb478e62aba 100644
--- a/pkgs/development/libraries/libwnck/default.nix
+++ b/pkgs/development/libraries/libwnck/default.nix
@@ -14,7 +14,7 @@
   gtk3,
   pango,
   cairo,
-  libXres,
+  libxres,
   libxi,
   libstartup_notification,
   gettext,
@@ -57,7 +57,7 @@ stdenv.mkDerivation rec {
     libstartup_notification
     pango
     cairo
-    libXres
+    libxres
     libxi
   ];