diff --git a/doc/languages-frameworks/gnome.section.md b/doc/languages-frameworks/gnome.section.md
index 62766b2c153ce..73f296737a40b 100644
--- a/doc/languages-frameworks/gnome.section.md
+++ b/doc/languages-frameworks/gnome.section.md
@@ -34,11 +34,11 @@ To allow software to use various virtual file systems, `gvfs` package can be als
 
 ### GdkPixbuf loaders {#ssec-gnome-gdk-pixbuf-loaders}
 
-GTK applications typically use [GdkPixbuf](https://developer.gnome.org/gdk-pixbuf/stable/) to load images. But `gdk-pixbuf` package only supports basic bitmap formats like JPEG, PNG or TIFF, requiring to use third-party loader modules for other formats. GTK itself includes SVG icons, which cannot be rendered without a loader provided by `librsvg`.
+GTK applications typically use [GdkPixbuf](https://developer.gnome.org/gdk-pixbuf/stable/) to load images. But `gdk-pixbuf` package only supports basic bitmap formats like JPEG, PNG or TIFF, requiring third-party loader modules for other formats. GTK itself includes SVG icons, which cannot be rendered without a loader provided by `librsvg`.
 
 Each loader package will contain a `lib/gdk-pixbuf-2.0/2.10.0/loaders.cache` file containing information about the available loaders. GdkPixbuf looks for these files in the `GDK_PIXBUF_MODULE_FILE` environment variable. Although upstream GdkPixbuf only supports a single file, in nixpkgs it is patched to accept multiple files, separated by `:`.
 
-[`wrapGAppsHook`]{#ssec-gnome-hooks-wrapgappshook} handles setting `GDK_PIXBUF_MODULE_FILE` for GTK apps. If you're manually constructing a wrapper, consider `--prefix`ing the variable rather than overwriting it, so that users can extend your program's capabilities through `services.xserver.gdk-pixbuf.modulePackages`.
+[`wrapGAppsHook`](#ssec-gnome-hooks-wrapgappshook) handles setting `GDK_PIXBUF_MODULE_FILE` for GTK apps. If you're manually constructing a wrapper, consider `--prefix`ing the variable rather than overwriting it, so that users can extend your program's capabilities through `services.xserver.gdk-pixbuf.modulePackages`.
 
 ### Icons {#ssec-gnome-icons}
 
diff --git a/pkgs/build-support/setup-hooks/wrap-gapps-hook/default.nix b/pkgs/build-support/setup-hooks/wrap-gapps-hook/default.nix
index 535db9a04dbc6..274e8f0806731 100644
--- a/pkgs/build-support/setup-hooks/wrap-gapps-hook/default.nix
+++ b/pkgs/build-support/setup-hooks/wrap-gapps-hook/default.nix
@@ -38,8 +38,8 @@ makeSetupHook {
     makeWrapper
   ];
   substitutions = {
-    STANDARD_GDK_PIXBUF_MODULES = lib.makeSearchPathOutput "lib" gdk-pixbuf.cacheFile [ gdk-pixbuf librsvg ];
-    GDK_PIXBUF_CACHE_FILE = gdk-pixbuf.cacheFile;
+    standardGdkPixbufModules = lib.makeSearchPathOutput "lib" gdk-pixbuf.cacheFile [ gdk-pixbuf librsvg ];
+    gdkPixbufCacheFile = gdk-pixbuf.cacheFile;
 
     passthru.tests = let
       sample-project = ./tests/sample-project;
@@ -71,11 +71,15 @@ makeSetupHook {
       # Stopgap as no modules have been packaged yet
       mock-pixbuf-module = stdenv.mkDerivation {
         name = "mock-gdk-pixbuf-module";
-        outputs = ["lib"];
-        builder = ''
+        outputs = ["out" "lib"];
+        dontUnpack = true;
+        buildPhase = ''
+          mkdir -p $out
           mkdir -p $lib/$(dirname ${gdk-pixbuf.cacheFile})
           touch $lib/${gdk-pixbuf.cacheFile}
         '';
+        dontInstall = true;
+        dontFixup = true;
       };
 
       pixbuf-modules = basic.overrideAttrs (old: {extraGdkPixbufModules = [mock-pixbuf-module];});
@@ -83,12 +87,12 @@ makeSetupHook {
       pixbuf-modules-check = let
         tested = pixbuf-modules;
       in testLib.runTest "pixbuf-modules-check" ''
-        ${expectSomeLineContainingYInFileXToMentionZ "${tested}/bin/foo" "GDK_PIXBUF_MODULE_FILE=" "${gdk-pixbuf}/${gdk-pixbuf.cacheFile}"}
-        ${expectSomeLineContainingYInFileXToMentionZ "${tested}/bin/foo" "GDK_PIXBUF_MODULE_FILE=" "${librsvg}/${gdk-pixbuf.cacheFile}"}
-        ${expectSomeLineContainingYInFileXToMentionZ "${tested}/bin/foo" "GDK_PIXBUF_MODULE_FILE=" "${mock-pixbuf-module}/${gdk-pixbuf.cacheFile}"}
-        ${expectSomeLineContainingYInFileXToMentionZ "${tested}/libexec/bar" "GDK_PIXBUF_MODULE_FILE=" "${gdk-pixbuf}/${gdk-pixbuf.cacheFile}"}
-        ${expectSomeLineContainingYInFileXToMentionZ "${tested}/libexec/bar" "GDK_PIXBUF_MODULE_FILE=" "${librsvg}/${gdk-pixbuf.cacheFile}"}
-        ${expectSomeLineContainingYInFileXToMentionZ "${tested}/libexec/bar" "GDK_PIXBUF_MODULE_FILE=" "${mock-pixbuf-module}/${gdk-pixbuf.cacheFile}"}
+        ${expectSomeLineContainingYInFileXToMentionZ "${tested}/bin/foo" "GDK_PIXBUF_MODULE_FILE" "${gdk-pixbuf}/${gdk-pixbuf.cacheFile}"}
+        ${expectSomeLineContainingYInFileXToMentionZ "${tested}/bin/foo" "GDK_PIXBUF_MODULE_FILE" "${librsvg}/${gdk-pixbuf.cacheFile}"}
+        ${expectSomeLineContainingYInFileXToMentionZ "${tested}/bin/foo" "GDK_PIXBUF_MODULE_FILE" "${mock-pixbuf-module}/${gdk-pixbuf.cacheFile}"}
+        ${expectSomeLineContainingYInFileXToMentionZ "${tested}/libexec/bar" "GDK_PIXBUF_MODULE_FILE" "${gdk-pixbuf}/${gdk-pixbuf.cacheFile}"}
+        ${expectSomeLineContainingYInFileXToMentionZ "${tested}/libexec/bar" "GDK_PIXBUF_MODULE_FILE" "${librsvg}/${gdk-pixbuf.cacheFile}"}
+        ${expectSomeLineContainingYInFileXToMentionZ "${tested}/libexec/bar" "GDK_PIXBUF_MODULE_FILE" "${mock-pixbuf-module}/${gdk-pixbuf.cacheFile}"}
       '';
 
       # Simple derivation containing a gobject-introspection typelib.
diff --git a/pkgs/build-support/setup-hooks/wrap-gapps-hook/wrap-gapps-hook.sh b/pkgs/build-support/setup-hooks/wrap-gapps-hook/wrap-gapps-hook.sh
index 4d7a1988919f2..a3b75ffa2761d 100644
--- a/pkgs/build-support/setup-hooks/wrap-gapps-hook/wrap-gapps-hook.sh
+++ b/pkgs/build-support/setup-hooks/wrap-gapps-hook/wrap-gapps-hook.sh
@@ -11,11 +11,11 @@ addEnvHooks "${targetOffset:?}" find_gio_modules
 
 gappsWrapperArgsHook() {
 
-    gappsWrapperArgs+=(--prefix GDK_PIXBUF_MODULE_FILE : "@STANDARD_GDK_PIXBUF_MODULES@")
+    gappsWrapperArgs+=(--prefix GDK_PIXBUF_MODULE_FILE : "@standardGdkPixbufModules@")
 
     if [ -n "$extraGdkPixbufModules" ]; then
         for pkg in $extraGdkPixbufModules; do
-            gappsWrapperArgs+=(--prefix GDK_PIXBUF_MODULE_FILE : "$pkg/@GDK_PIXBUF_CACHE_FILE@")
+            gappsWrapperArgs+=(--prefix GDK_PIXBUF_MODULE_FILE : "$pkg/@gdkPixbufCacheFile@")
         done
     fi