diff --git a/libafl/src/executors/forkserver.rs b/libafl/src/executors/forkserver.rs
index 9db3436135..606be4c635 100644
--- a/libafl/src/executors/forkserver.rs
+++ b/libafl/src/executors/forkserver.rs
@@ -100,7 +100,7 @@ impl ConfigTarget for Command {
             return self;
         }
         let func = move || {
-            let memlimit: libc::rlim_t = memlimit << 20;
+            let memlimit: libc::rlim_t = (memlimit as libc::rlim_t) << 20;
             let r = libc::rlimit {
                 rlim_cur: memlimit,
                 rlim_max: memlimit,