diff --git a/src/quantities.jl b/src/quantities.jl
index b6b4a422..cfd2a863 100644
--- a/src/quantities.jl
+++ b/src/quantities.jl
@@ -119,6 +119,7 @@ end
 Base.mod2pi(x::DimensionlessQuantity) = mod2pi(uconvert(NoUnits, x))
 Base.mod2pi(x::AbstractQuantity{S, NoDims, <:Units{(Unitful.Unit{:Degree, NoDims}(0, 1//1),),
     NoDims}}) where S = mod(x, 360°)
+Base.modf(x::DimensionlessQuantity) = modf(uconvert(NoUnits, x))
 
 # Addition / subtraction
 for op in [:+, :-]
diff --git a/test/runtests.jl b/test/runtests.jl
index b3afd6c9..7a6a301b 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -630,6 +630,7 @@ end
         @test mod(1hr+3minute+5s, 24s) == 17s
         @test mod2pi(360°) === 0°           # 2pi is 360°
         @test mod2pi(0.5pi*u"m/dm") ≈ pi    # just testing the dimensionless fallback
+        @test modf(2.5rad) === (0.5, 2.0)
         @test @inferred(inv(s)) === s^-1
         @test inv(ContextUnits(m,km)) === ContextUnits(m^-1,km^-1)
         @test inv(FixedUnits(m)) === FixedUnits(m^-1)