diff --git a/test/rulesets/Base/indexing.jl b/test/rulesets/Base/indexing.jl
index 7500b36d6..3dbf553f1 100644
--- a/test/rulesets/Base/indexing.jl
+++ b/test/rulesets/Base/indexing.jl
@@ -247,7 +247,7 @@ end
     )
     @test back([fill(Tangent{Any}(; x=0.0, y=1.0), 2, 3), fill(ZeroTangent(), 2, 3)]) == (
         NoTangent(),
-        cat(fill(Tangent{Any}(; x=0.0, y=1.0), 2, 3), fill(ZeroTangent(), 2, 3); dims=3)
+        cat(fill(Tangent{Any}(; x=0.0, y=1.0), 2, 3), fill(ZeroTangent(), 2, 3); dims=3),
     )
 
     # Second derivative rule