diff --git a/pkgs/by-name/gn/gnome-maps/package.nix b/pkgs/by-name/gn/gnome-maps/package.nix
index 863ffb85cbe6..2add8e28306f 100644
--- a/pkgs/by-name/gn/gnome-maps/package.nix
+++ b/pkgs/by-name/gn/gnome-maps/package.nix
@@ -76,6 +76,16 @@ stdenv.mkDerivation (finalAttrs: {
     ''}"
   ];
 
+  postPatch = ''
+    # The .service file isn't wrapped with the correct environment
+    # so misses GIR files when started. By re-pointing from the gjs
+    # entry point to the wrapped binary we get back to a wrapped
+    # binary.
+    substituteInPlace "data/org.gnome.Maps.service.in" \
+      --replace-fail "Exec=@pkgdatadir@/@app-id@" \
+                     "Exec=$out/bin/gnome-maps"
+  '';
+
   preCheck = ''
     # “time.js” included by “timeTest” and “translationsTest” depends on “org.gnome.desktop.interface” schema.
     export XDG_DATA_DIRS="${gsettings-desktop-schemas}/share/gsettings-schemas/${gsettings-desktop-schemas.name}:$XDG_DATA_DIRS"