diff --git a/components/lib/fileupload/FileContent.vue b/components/lib/fileupload/FileContent.vue
index a6df717de..ce4f04895 100644
--- a/components/lib/fileupload/FileContent.vue
+++ b/components/lib/fileupload/FileContent.vue
@@ -54,7 +54,7 @@ export default {
         formatSize(bytes) {
             const k = 1024;
             const dm = 3;
-            const sizes = this.$primevue.config.locale.fileSizeTypes;
+            const sizes = this.$primevue.config.locale?.fileSizeTypes;
 
             if (bytes === 0) {
                 return `0 ${sizes[0]}`;
diff --git a/components/lib/fileupload/FileUpload.vue b/components/lib/fileupload/FileUpload.vue
index 25f232aa9..1da081309 100755
--- a/components/lib/fileupload/FileUpload.vue
+++ b/components/lib/fileupload/FileUpload.vue
@@ -328,7 +328,7 @@ export default {
         formatSize(bytes) {
             const k = 1024;
             const dm = 3;
-            const sizes = this.$primevue.config.locale.fileSizeTypes;
+            const sizes = this.$primevue.config.locale?.fileSizeTypes;
 
             if (bytes === 0) {
                 return `0 ${sizes[0]}`;
diff --git a/doc/fileupload/TemplateDoc.vue b/doc/fileupload/TemplateDoc.vue
index 3637a38e6..a0819e921 100644
--- a/doc/fileupload/TemplateDoc.vue
+++ b/doc/fileupload/TemplateDoc.vue
@@ -317,7 +317,7 @@ const onTemplatedUpload = () => {
     toast.add({ severity: "info", summary: "Success", detail: "File Uploaded", life: 3000 });
 };
 
-formatSize(bytes) {
+const formatSize = (bytes) => {
     const k = 1024;
     const dm = 3;
     const sizes = this.$primevue.config.locale.fileSizeTypes;