diff --git a/src/FixedPointNumbers.jl b/src/FixedPointNumbers.jl
index 00cbdfef..0c75d4bf 100644
--- a/src/FixedPointNumbers.jl
+++ b/src/FixedPointNumbers.jl
@@ -4,7 +4,7 @@ module FixedPointNumbers
 
 using Compat
 
-import Base: ==, <, <=, -, +, *, /,
+import Base: ==, <, <=, -, +, *, /, ~,
              convert, promote_rule, show, showcompact, isinteger, abs, decompose,
              isnan, isinf, isfinite,
              zero, one, typemin, typemax, realmin, realmax, eps, sizeof, reinterpret,
diff --git a/src/ufixed.jl b/src/ufixed.jl
index e4f4de2f..26a2cc77 100644
--- a/src/ufixed.jl
+++ b/src/ufixed.jl
@@ -82,6 +82,9 @@ sizeof{T<:Ufixed}(::Type{T}) = sizeof(rawtype(T))
 abs(x::Ufixed) = x
 
 # Arithmetic
+(-){T<:Ufixed}(x::T) = T(-reinterpret(x), 0)
+(~){T<:Ufixed}(x::T) = T(~reinterpret(x), 0)
+
 +{T,f}(x::UfixedBase{T,f}, y::UfixedBase{T,f}) = convert(Float32, x)+convert(Float32, y) # UfixedBase{T,f}(convert(T, reinterpret(x)+reinterpret(y)),0)
 -{T,f}(x::UfixedBase{T,f}, y::UfixedBase{T,f}) = convert(Float32, x)-convert(Float32, y) # UfixedBase{T,f}(convert(T, reinterpret(x)-reinterpret(y)),0)
 *{T,f}(x::UfixedBase{T,f}, y::UfixedBase{T,f}) = convert(Float32, x)*convert(Float32, y)
diff --git a/test/ufixed.jl b/test/ufixed.jl
index 4cdc9db9..9293175f 100644
--- a/test/ufixed.jl
+++ b/test/ufixed.jl
@@ -59,6 +59,10 @@ for T in FixedPointNumbers.UF
 end
 @test convert(Rational, convert(Ufixed8, 0.5)) == 0x80//0xff
 
+x = Ufixed8(0b01010001, 0)
+@test ~x == Ufixed8(0b10101110, 0)
+@test -x == 0xafuf8
+
 for T in FixedPointNumbers.UF
     x = T(0x10,0)
     y = T(0x25,0)