diff --git a/Project.toml b/Project.toml
index 68833cf3..796ec890 100644
--- a/Project.toml
+++ b/Project.toml
@@ -13,7 +13,8 @@ julia = "1.3"
 
 [extras]
 ChainRulesTestUtils = "cdddcdb0-9152-4a09-a978-84456f9df70a"
+Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [targets]
-test = ["ChainRulesTestUtils", "Test"]
+test = ["ChainRulesTestUtils", "Random", "Test"]
diff --git a/test/chainrules.jl b/test/chainrules.jl
index 1a5749ce..f5b715f9 100644
--- a/test/chainrules.jl
+++ b/test/chainrules.jl
@@ -1,4 +1,6 @@
 @testset "chainrules" begin
+    Random.seed!(1)
+
     @testset "general" begin
         for x in (1.0, -1.0, 0.0, 0.5, 10.0, -17.1, 1.5 + 0.7im)
             test_scalar(erf, x)
diff --git a/test/runtests.jl b/test/runtests.jl
index 64e60bed..9af67ec9 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -2,6 +2,7 @@
 
 using SpecialFunctions
 using ChainRulesTestUtils
+using Random
 using Test
 using Base.MathConstants: γ