diff --git a/env/sles15/x86_64/sysconfigs/packages.yaml b/env/sles15/x86_64/sysconfigs/packages.yaml
index 7ef39fd..4f47d4b 100644
--- a/env/sles15/x86_64/sysconfigs/packages.yaml
+++ b/env/sles15/x86_64/sysconfigs/packages.yaml
@@ -132,6 +132,7 @@ packages:
     externals:
       - modules:
           - libfabric/1.15.2.0
+        prefix: /opt/cray/libfabric/1.15.2.0
         spec: libfabric@1.15.2.0
   libiconv:
     require: '%gcc@7.5.0'