diff --git a/test/runtests.jl b/test/runtests.jl
index 91e94bd..e66233c 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -7,4 +7,5 @@ using Test
     @test all(CosmoTools.Ω.(CosmoTools.DarkEnergy, 10. .^range(-2, 6, 100)) .<= 1.0)
     @test all(CosmoTools.transfer_function.(10 .^range(-4, 6, 100)) .>= 0)
     @test all(CosmoTools.matter_power_spectrum.(10 .^range(-4, 6, 100)) .>= 0)
+    @test all(CosmoTools.matter_power_spectrum.(10 .^range(-4, 6, 100)) .>= 0)
 end