diff --git a/demos/linux-ltp/prepare_ltp.sh b/demos/linux-ltp/prepare_ltp.sh
index eb286061..f198b1bf 100755
--- a/demos/linux-ltp/prepare_ltp.sh
+++ b/demos/linux-ltp/prepare_ltp.sh
@@ -9,7 +9,7 @@ rm -rf image
 copy_bom -f ../ltp.yaml --root image --include-dir /opt/occlum/etc/template
 
 new_json="$(jq '.resource_limits.user_space_size = "3000MB" |
-                .resource_limits.kernel_space_heap_size ="512MB" |
+                .resource_limits.kernel_space_heap_size ="1024MB" |
                 .resource_limits.kernel_space_stack_size ="4MB" |
                 .resource_limits.max_num_of_threads = 96 |
                 .entry_points = [ "/opt/ltp" ] |