diff --git a/packaging/packages/synit-config/files/sbin/synit-init.sh b/packaging/packages/synit-config/files/sbin/synit-init.sh
index 04909f7..15c41f3 100755
--- a/packaging/packages/synit-config/files/sbin/synit-init.sh
+++ b/packaging/packages/synit-config/files/sbin/synit-init.sh
@@ -6,7 +6,8 @@ mkdir /dev/pts
 mount -t devpts none /dev/pts
 
 mkdir /dev/shm
-mount -t tmpfs -o nodev,nosuid,noexec none /dev/shm
+mount -t tmpfs -o nodev,nosuid,exec none /dev/shm
+# ^ must be mounted "exec" to allow JIT for Squeak
 
 mount -t proc none /proc