diff --git a/README.md b/README.md
index 4ba069810..080e1f251 100644
--- a/README.md
+++ b/README.md
@@ -48,8 +48,6 @@ Currently, the `@compat` macro supports the following syntaxes:
   `CartesianRange` now has two type parameters, so using them as
   fields in other `struct`s requires manual intervention.
 
-* Required keyword arguments ([#25830]). For example, `@compat foo(; x, y)` makes `x` and `y` required keyword arguments: when calling `foo`, an error is thrown if `x` or `y` is not explicitly provided.
-
 ## Module Aliases
 
 ## New functions, macros, and methods
diff --git a/src/compatmacro.jl b/src/compatmacro.jl
index 09234c613..97a78771b 100644
--- a/src/compatmacro.jl
+++ b/src/compatmacro.jl
@@ -4,27 +4,9 @@
 using Base.Meta
 export @compat
 
-if !isdefined(Base, :UndefKeywordError)
-    struct UndefKeywordError <: Exception
-        kw
-    end
-    Base.showerror(io::IO, e::UndefKeywordError) = print(io, "UndefKeywordError: keyword argument $(e.kw) not assigned")
-    export UndefKeywordError
-end
-
-"Convert a functions symbol argument to the corresponding required keyword argument."
-function symbol2kw(sym::Symbol)
-    Expr(:kw, sym, Expr(:call, throw, UndefKeywordError(sym)))
-end
-symbol2kw(arg) = arg
-
 function _compat(ex::Expr)
     if ex.head === :call
         f = ex.args[1]
-        if !isdefined(Base, :UndefKeywordError) && length(ex.args) > 1 && isexpr(ex.args[2], :parameters)
-            params = ex.args[2]
-            params.args = map(symbol2kw, params.args)
-        end
     elseif ex.head === :quote && isa(ex.args[1], Symbol)
         # Passthrough
         return ex
diff --git a/test/old.jl b/test/old.jl
index 771f941c0..a91c7e63a 100644
--- a/test/old.jl
+++ b/test/old.jl
@@ -1277,3 +1277,21 @@ if VERSION < v"0.7.0-beta2.143"
         @test_throws UndefKeywordError dropdims(a)
     end
 end
+
+let
+    # test required keyword arguments
+    @compat func1() = 1
+    @test func1() == 1 # using the function works
+    @compat func2(x) = x
+    @test func2(3) == 3 # using the function works
+    @compat func3(;y) = y
+    @test func3(y=2) == 2 # using the function works
+    @test_throws UndefKeywordError func3()
+    @compat func4(x; z) = x*z
+    @test func4(2,z=3) == 6 # using the function works
+    @test_throws UndefKeywordError func4(2)
+    @compat func5(;x=1, y) = x*y
+    @test func5(y=3) == 3
+    @test func5(y=3, x=2) == 6
+    @test_throws UndefKeywordError func5(x=2)
+end
diff --git a/test/runtests.jl b/test/runtests.jl
index 167733fc0..ba72fa9da 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -80,24 +80,6 @@ let A = [1]
     @test x == 1
 end
 
-let
-    # test required keyword arguments
-    @compat func1() = 1
-    @test func1() == 1 # using the function works
-    @compat func2(x) = x
-    @test func2(3) == 3 # using the function works
-    @compat func3(;y) = y
-    @test func3(y=2) == 2 # using the function works
-    @test_throws UndefKeywordError func3()
-    @compat func4(x; z) = x*z
-    @test func4(2,z=3) == 6 # using the function works
-    @test_throws UndefKeywordError func4(2)
-    @compat func5(;x=1, y) = x*y
-    @test func5(y=3) == 3
-    @test func5(y=3, x=2) == 6
-    @test_throws UndefKeywordError func5(x=2)
-end
-
 # Support for positional `stop`
 @test Compat.range(0, 5, length = 6) == 0.0:1.0:5.0
 @test Compat.range(0, 10, step = 2) == 0:2:10