diff --git a/lib/spack/spack/platforms/cray.py b/lib/spack/spack/platforms/cray.py
index 70bb45af5f8..3d88285f70c 100644
--- a/lib/spack/spack/platforms/cray.py
+++ b/lib/spack/spack/platforms/cray.py
@@ -37,7 +37,7 @@
 
 
 def slingshot_network():
-    return os.path.exists("/lib64/libcxi.so")
+    return os.path.exists("/opt/cray/pe") and os.path.exists("/lib64/libcxi.so")
 
 
 def _target_name_from_craype_target_name(name):