diff --git a/src/intervals/functions.jl b/src/intervals/functions.jl
index 588b163d7..fdb3f3f16 100644
--- a/src/intervals/functions.jl
+++ b/src/intervals/functions.jl
@@ -375,7 +375,7 @@ function nthroot(a::Interval{T}, n::Integer) where T
 end
 
 """
-Calculate `x::Interval mod y::Real`, limited by `y != 0`.
+Calculate `x::Interval mod y::Real` where y != zero(y) and y is not inteval`.
 """
 function mod(x::Interval, y::Real)
     @assert y != zero(y) """mod(x::Interval, y::Real) 
@@ -389,4 +389,5 @@ is currently implemented only for a strictly positive or negative divisor y."""
     end
 end
 
-mod(x:T, y::Interval) where T = throw(ArgumentError("mod not defined for interval as divisor `y`"))
+mod(x::Interval, y::Interval) where T = throw(ArgumentError("mod not defined for interval as divisor `y`"))
+mod(x::Real, y::Interval) where T = throw(ArgumentError("mod not defined for interval as divisor `y`"))
diff --git a/test/interval_tests/numeric.jl b/test/interval_tests/numeric.jl
index d933f9c7c..11f1d0877 100644
--- a/test/interval_tests/numeric.jl
+++ b/test/interval_tests/numeric.jl
@@ -472,5 +472,6 @@ end
     @test mod(x, -0.5) == -0.5..0
 
     # TODO - implement mod for two intervals
-    @test_throws TypeError mod(1..2, 1.4..1.5)
+    @test_throws ArgumentError mod(1..2, 1.4..1.5)
+    @test_throws ArgumentError mod(1.0, 1.4..1.5)
 end