diff --git a/itext/itext.forms/itext/forms/fields/PdfButtonFormField.cs b/itext/itext.forms/itext/forms/fields/PdfButtonFormField.cs
index 352b9f62b0..39bd062ace 100644
--- a/itext/itext.forms/itext/forms/fields/PdfButtonFormField.cs
+++ b/itext/itext.forms/itext/forms/fields/PdfButtonFormField.cs
@@ -241,7 +241,7 @@ public virtual iText.Forms.Fields.PdfButtonFormField SetRadiosInUnison(bool radi
         /// <see cref="PdfButtonFormField"/>
         /// </returns>
         public virtual iText.Forms.Fields.PdfButtonFormField SetImage(String image) {
-            Stream @is = FileUtil.GetInputStreamForFile(image);
+            using Stream @is = FileUtil.GetInputStreamForFile(image);
             String str = Convert.ToBase64String(StreamUtil.InputStreamToArray(@is));
             return (iText.Forms.Fields.PdfButtonFormField)SetValue(str);
         }