diff --git a/data/xap/xap_0.1.0.hjson b/data/xap/xap_0.1.0.hjson
index 75beb98e89..5eb1459d65 100755
--- a/data/xap/xap_0.1.0.hjson
+++ b/data/xap/xap_0.1.0.hjson
@@ -316,7 +316,7 @@
                     name: Config Blob Length
                     define: CONFIG_BLOB_LEN
                     description: Retrieves the length of the configuration data bundled within the firmware
-                    return_type: u32
+                    return_type: u16
                     return_constant: CONFIG_BLOB_GZ_LEN
                 }
                 0x06: {