diff --git a/modules/misc/xdg-mime-apps.nix b/modules/misc/xdg-mime-apps.nix
index b28f488a8..feeef7b30 100644
--- a/modules/misc/xdg-mime-apps.nix
+++ b/modules/misc/xdg-mime-apps.nix
@@ -161,7 +161,7 @@ in
 
               existing="$(crudini --get $out 'Default Applications' "$mime" 2>/dev/null || true)"
               local value="$existing''${existing:+;}''$name"
-              crudini --inplace --set $out 'Default Applications' "$mime" "$value"
+              crudini --ini-options=nospace --inplace --set $out 'Default Applications' "$mime" "$value"
             }
 
             install -m644 ${baseFile} $out
diff --git a/tests/modules/misc/xdg/mime-apps-basics-expected.ini b/tests/modules/misc/xdg/mime-apps-basics-expected.ini
index a4bc44bcd..25542b516 100644
--- a/tests/modules/misc/xdg/mime-apps-basics-expected.ini
+++ b/tests/modules/misc/xdg/mime-apps-basics-expected.ini
@@ -4,7 +4,7 @@ image/png=foo1.desktop;foo2.desktop;foo3.desktop
 
 [Default Applications]
 image/png=default1.desktop;default2.desktop;test.desktop
-image/svg+xml = test.desktop
+image/svg+xml=test.desktop
 
 [Removed Associations]
 image/png=foo5.desktop