diff --git a/CHANGES.md b/CHANGES.md
index 393839281..c3bf4b5aa 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -2,6 +2,10 @@
 
 ## Version 0.7.3-DEV (released 2021-XYZ)
 
+- Remove `Base.big(obj::GapObj)`: nothing was using it and it does not really
+  fit conceptually into this package.
+
+
 ## Version 0.7.2 (released 2021-11-17)
 
 - Use a `GAP_pkg_juliainterface_jll` to installed a compiled version of the
diff --git a/docs/src/conversion.md b/docs/src/conversion.md
index 2575e1b8c..1f02dbff4 100644
--- a/docs/src/conversion.md
+++ b/docs/src/conversion.md
@@ -59,7 +59,6 @@ Int128
 BigInt
 Rational
 Float64
-big
 Char
 Cuchar
 String
diff --git a/src/constructors.jl b/src/constructors.jl
index 98c119935..d467dafb0 100644
--- a/src/constructors.jl
+++ b/src/constructors.jl
@@ -79,45 +79,6 @@ julia> Int128(val)
 """ Int128
 
 
-"""
-    big(obj::GapObj)
-
-Return the big integer converted from
-the [GAP integer](GAP_ref(ref:Integers)) `obj`,
-or the big rational converted from
-the [GAP rational](GAP_ref(ref:Rationals)) `obj`,
-or the big float converted from
-the [GAP float](GAP_ref(ref:Floats)) `obj`.
-
-# Examples
-```jldoctest
-julia> val = GAP.evalstr("2^64")
-GAP: 18446744073709551616
-
-julia> big(val)
-18446744073709551616
-
-julia> val = GAP.evalstr("1/3")
-GAP: 1/3
-
-julia> big(val)
-1//3
-
-julia> val = GAP.evalstr("1.1")
-GAP: 1.1
-
-julia> big(val)
-1.100000000000000088817841970012523233890533447265625
-
-```
-"""
-function Base.big(obj::GapObj)
-    GAP_IS_INT(obj) && return BigInt(obj)
-    GAP_IS_RAT(obj) && return Rational{BigInt}(obj)
-    GAP_IS_MACFLOAT(obj) && return BigFloat(obj)
-    throw(ConversionError(obj, "a type supported by big"))
-end
-
 ## Rationals
 """
     Rational{T}(obj::GapObj) where {T<:Integer}
diff --git a/test/constructors.jl b/test/constructors.jl
index 8da91cafa..39767f8f7 100644
--- a/test/constructors.jl
+++ b/test/constructors.jl
@@ -46,17 +46,6 @@
     @test_throws GAP.ConversionError Float64(x)
   end
 
-  @testset "big (is not a constructor but fits here)" begin
-    x = GAP.evalstr("2^100")
-    @test big(x) == BigInt(2)^100
-    x = GAP.evalstr("2^100/3")
-    @test big(x) == BigInt(2)^100 // 3
-    x = GAP.evalstr("2.")
-    @test big(x) == BigFloat(2.0)
-    x = GAP.evalstr("[]")
-    @test_throws GAP.ConversionError big(x)
-  end
-
   @testset "Chars" begin
     x = GAP.evalstr("'x'")
     @test Cuchar(x) == Cuchar('x')