diff --git a/lib/spack/spack/compilers/fj.py b/lib/spack/spack/compilers/fj.py
index 083fe35b0d0..1f7d52f0261 100644
--- a/lib/spack/spack/compilers/fj.py
+++ b/lib/spack/spack/compilers/fj.py
@@ -61,7 +61,3 @@ def c11_flag(self):
     @property
     def pic_flag(self):
         return "-KPIC"
-
-    def setup_custom_environment(self, pkg, env):
-        env.append_flags('fcc_ENV', '-Nclang')
-        env.append_flags('FCC_ENV', '-Nclang')