diff --git a/test/runtests.jl b/test/runtests.jl
index e29bb5708..b1d2d03e6 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -20,7 +20,7 @@ else
     ("LD_LIBRARY_PATH", ":")
 end
 function with_libgfortran(f::Function)
-    libpath_list = [csl_path split(get(ENV, LIBPATH_var, ""), envsep)]
+    libpath_list = [csl_path, split(get(ENV, LIBPATH_var, ""), envsep)...]
     libpath = join(filter(x -> !isempty(x), libpath_list), envsep)
     withenv(f, LIBPATH_var => libpath)
 end