diff --git a/test/intrinsics.jl b/test/intrinsics.jl
index 993efc63a4c03..0e8b2ec98fc23 100644
--- a/test/intrinsics.jl
+++ b/test/intrinsics.jl
@@ -100,3 +100,6 @@ let f = Core.Intrinsics.ashr_int
     @test f(Int32(-1), -10) == -1
     @test f(Int32(2), -1) == 0
 end
+
+# issue #29929
+@test unsafe_store!(Ptr{Nothing}(C_NULL), nothing) == Ptr{Nothing}(0)