diff --git a/test/numbers.jl b/test/numbers.jl
index be661da6783feb..a9d126aa33d5a9 100644
--- a/test/numbers.jl
+++ b/test/numbers.jl
@@ -2901,6 +2901,7 @@ end
     let float_types = Set()
         allsubtypes!(Base, AbstractFloat, float_types)
         allsubtypes!(Core, AbstractFloat, float_types)
+        filter!(!isequal(Core.BFloat16), float_types)   # defined externally
         @test !isempty(float_types)
 
         for T in float_types