diff --git a/test/runtests.jl b/test/runtests.jl
index 9b0071e..52e26d4 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -1,4 +1,6 @@
 using PopplerMWE
 using Test
 
+@show get(ENV, "LD_PRELOAD", nothing)
+
 @test PopplerMWE.run()