diff --git a/src/opnsense/scripts/firmware/check.sh b/src/opnsense/scripts/firmware/check.sh
index c7c9a2757..609a9adf7 100755
--- a/src/opnsense/scripts/firmware/check.sh
+++ b/src/opnsense/scripts/firmware/check.sh
@@ -365,7 +365,10 @@ if [ -n "${packages_is_size}" ]; then
     if [ "${kernel_to_delete}" != "${upgrade_major_version}" ]; then
         kernel_is_size="$(opnsense-update -SRk)"
         if [ -n "${kernel_is_size}" ]; then
-            sets_upgraded="${sets_upgraded},{\"name\":\"kernel\",\"size\":\"${kernel_is_size}\",\"current_version\":\"${kernel_to_delete}\",\"new_version\":\"${upgrade_major_version}\",\"repository\":\"${product_repo}\"}"
+            if [ -n "${sets_upgraded}" ]; then
+                sets_upgraded="${sets_upgraded},"
+            fi
+            sets_upgraded="${sets_upgraded}{\"name\":\"kernel\",\"size\":\"${kernel_is_size}\",\"current_version\":\"${kernel_to_delete}\",\"new_version\":\"${upgrade_major_version}\",\"repository\":\"${product_repo}\"}"
             upgrade_needs_reboot="1"
         fi
     fi
@@ -374,7 +377,10 @@ if [ -n "${packages_is_size}" ]; then
     if [ "${base_to_delete}" != "${upgrade_major_version}" ]; then
         base_is_size="$(opnsense-update -SRb)"
         if [ -n "${base_is_size}" ]; then
-            sets_upgraded="${sets_upgraded},{\"name\":\"base\",\"size\":\"${base_is_size}\",\"current_version\":\"${base_to_delete}\",\"new_version\":\"${upgrade_major_version}\",\"repository\":\"${product_repo}\"}"
+            if [ -n "${sets_upgraded}" ]; then
+                sets_upgraded="${sets_upgraded},"
+            fi
+            sets_upgraded="${sets_upgraded}{\"name\":\"base\",\"size\":\"${base_is_size}\",\"current_version\":\"${base_to_delete}\",\"new_version\":\"${upgrade_major_version}\",\"repository\":\"${product_repo}\"}"
             upgrade_needs_reboot="1"
         fi
     fi