diff --git a/src/bfloat16.jl b/src/bfloat16.jl
index 4148a2d..b3e06a6 100644
--- a/src/bfloat16.jl
+++ b/src/bfloat16.jl
@@ -245,7 +245,7 @@ else
     for f in (:+, :-, :*, :/, :^)
         @eval ($f)(x::BFloat16, y::BFloat16) = BFloat16($(f)(Float32(x), Float32(y)))
     end
-    -(x::BFloat16) = reinterpret(BFloat16, reinterpret(Unsigned, x) ⊻ sign_mask(BFloat16))
+    -(x::BFloat16) = BFloat16(0) - x
 end
 ^(x::BFloat16, y::Integer) = BFloat16(Float32(x)^y)
 
@@ -454,4 +454,4 @@ Base.read(io::IO, ::Type{BFloat16})::BFloat16 = reinterpret(BFloat16, read(io, U
 Base.bswap(x::BFloat16) = Base.bswap_int(x)
 
 # irrationals
-BFloat16(x::AbstractIrrational) = BFloat16(Float32(x)::Float32)
+BFloat16(x::AbstractIrrational) = BFloat16(Float32(x)::Float32)
\ No newline at end of file
diff --git a/test/runtests.jl b/test/runtests.jl
index d3524d5..f70f320 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -104,6 +104,9 @@ end
     @test zero(BFloat16) == BFloat16(0.0f0)
     @test one(BFloat16) == BFloat16(1.0)
     @test BFloat16(2.0) ^ -2 == BFloat16(0.25)
+    @test -one(BFloat16) == BFloat16(-1.0)
+    @test -zero(BFloat16) == BFloat16(-0.0)
+    @test -BFloat16(-1.0) == one(BFloat16)
 end
 
 @testset "printf" begin
@@ -292,4 +295,4 @@ include("structure.jl")
 include("mathfuncs.jl")
 include("lowprecarrays.jl")
 
-end # @testset "BFloat16s"
+end # @testset "BFloat16s"
\ No newline at end of file