diff --git a/pkgs/development/ruby-modules/gem-config/default.nix b/pkgs/development/ruby-modules/gem-config/default.nix
index 586e2ca04813..8bc22d9c9a7f 100644
--- a/pkgs/development/ruby-modules/gem-config/default.nix
+++ b/pkgs/development/ruby-modules/gem-config/default.nix
@@ -358,7 +358,7 @@ in
         --replace "gobject-2.0" "${glib.out}/lib/libgobject-2.0${stdenv.hostPlatform.extensions.sharedLibrary}"
 
       substituteInPlace lib/vips.rb \
-        --replace "vips_libname = 'vips'" "vips_libname = '${vips.out}/lib/libvips${stdenv.hostPlatform.extensions.sharedLibrary}'"
+        --replace "vips_libname = 'vips'" "vips_libname = '${vips}/lib/libvips${stdenv.hostPlatform.extensions.sharedLibrary}'"
     '';
   };