diff --git a/src/Magick.NET.Core/IMagickImage.cs b/src/Magick.NET.Core/IMagickImage.cs
index f25748317a..43f177a622 100644
--- a/src/Magick.NET.Core/IMagickImage.cs
+++ b/src/Magick.NET.Core/IMagickImage.cs
@@ -3493,6 +3493,13 @@ Interlace Interlace
     /// <returns>A base64 <see cref="string"/>.</returns>
     string ToBase64(MagickFormat format);
 
+    /// <summary>
+    /// Converts this instance to a base64 <see cref="string"/>.
+    /// </summary>
+    /// <param name="defines">The defines to set.</param>
+    /// <returns>A base64 <see cref="string"/>.</returns>
+    string ToBase64(IWriteDefines defines);
+
     /// <summary>
     /// Converts this instance to a <see cref="byte"/> array.
     /// </summary>