diff --git a/source/thirdparty/src/base64.cpp b/source/thirdparty/src/base64.cpp
index 16b2c2e36..e7099711a 100644
--- a/source/thirdparty/src/base64.cpp
+++ b/source/thirdparty/src/base64.cpp
@@ -89,6 +89,7 @@ TArray<uint8_t> base64_encode(unsigned char const* bytes_to_encode, size_t in_le
     while((i++ < 3))
       reta.Push('=');
 
+    reta.Push(0);
   }
 
   return reta;