diff --git a/build/moz.configure/libraries.configure b/build/moz.configure/libraries.configure
index 3c3c713a40f0..26ca886f60fb 100644
--- a/build/moz.configure/libraries.configure
+++ b/build/moz.configure/libraries.configure
@@ -131,7 +131,7 @@ with only_when(building_with_gnu_compatible_cc):
 
     is_libatomic_optional = check_std_atomic_requirements()
     is_libatomic_required = check_std_atomic_requirements(
-        flag="-latomic", when=~is_libatomic_optional
+        flag=["-latomic"], when=~is_libatomic_optional
     )
 
     @depends(is_libatomic_optional, is_libatomic_required)