diff --git a/src/uu/lsmem/src/lsmem.rs b/src/uu/lsmem/src/lsmem.rs
index b7f1d71..8f02ef8 100644
--- a/src/uu/lsmem/src/lsmem.rs
+++ b/src/uu/lsmem/src/lsmem.rs
@@ -578,7 +578,11 @@ fn print_json(lsmem: &Lsmem, opts: &Options) {
         for column in &opts.columns {
             record.insert(
                 column.get_name().to_lowercase(),
-                serde_json::Value::String(row.get_value(column)),
+                if column == &Column::Size && opts.bytes {
+                    serde_json::Value::Number(row.get_value(column).parse().unwrap())
+                } else {
+                    serde_json::Value::String(row.get_value(column))
+                },
             );
         }
         memory_records.push(serde_json::Value::Object(record));
diff --git a/tests/by-util/test_lsmem.rs b/tests/by-util/test_lsmem.rs
index 5cbaa61..6e15b06 100644
--- a/tests/by-util/test_lsmem.rs
+++ b/tests/by-util/test_lsmem.rs
@@ -65,11 +65,10 @@ fn test_json_all() {
     sysroot_test_with_args("test_lsmem_json_all.expected", &["-J", "-a"]);
 }
 
-// FAILS, COMMENT FOR NOW - TODO
-// #[test]
-// fn test_json_bytes() {
-//     sysroot_test_with_args("test_lsmem_json_bytes.expected", &["-J", "-b"]);
-// }
+#[test]
+fn test_json_bytes() {
+    sysroot_test_with_args("test_lsmem_json_bytes.expected", &["-J", "-b"]);
+}
 
 #[test]
 fn test_json_noheadings() {