diff --git a/src/engine/service/runner/backend/generic.rs b/src/engine/service/runner/backend/generic.rs
index 98d9a37..b0ae392 100644
--- a/src/engine/service/runner/backend/generic.rs
+++ b/src/engine/service/runner/backend/generic.rs
@@ -7,15 +7,18 @@ use futures::FutureExt;
 use nonempty::NonEmpty;
 use tokio::sync::oneshot::Sender;
 
-use crate::engine::{
-    service::runner::backend::backend_config::substitute_placeholders, task::resources, Task,
-};
+use crate::engine::{service::runner::backend::backend_config::substitute_placeholders, Task};
 
 use super::{
     backend_config::{BackendConfig, BackendType},
     Backend, ExecutionResult, Reply,
 };
 
+/// cwd parameter name for lsf
+const CWD: &str = "cwd";
+/// memory parameter name for lsf
+const MEMORY: &str = "memory";
+
 /// A generic backend
 #[derive(Debug)]
 pub struct GenericBackend {
@@ -111,13 +114,13 @@ impl Backend for GenericRunner {
                 };
 
                 if let Some(cwd) = exec.workdir() {
-                    substitutions.insert("cwd".to_string(), cwd.to_string());
+                    substitutions.insert(CWD.to_string(), cwd.to_string());
                 }
 
                 if let Some(resources) = task.resources() {
                     if let Some(gb) = resources.ram_gb() {
                         substitutions
-                            .insert("mem".to_string(), ((gb * 1000f64) as usize).to_string());
+                            .insert(MEMORY.to_string(), ((gb * 1000f64) as usize).to_string());
                     }
                 }