diff --git a/libluna/src/Base64.cpp b/libluna/src/Base64.cpp
index 64a74e0d..6dd0bd3b 100644
--- a/libluna/src/Base64.cpp
+++ b/libluna/src/Base64.cpp
@@ -161,6 +161,6 @@ namespace Base64
         u8 nul_byte = '\0';
         TRY(buf.append_data(&nul_byte, 1));
 
-        return String { (char*)buf.release_data(), buf.size() };
+        return String { (char*)buf.release_data(), buf.size() - 1 };
     }
 }