diff --git a/compatibility_matrices/compatibility_matrix.6.xml b/compatibility_matrices/compatibility_matrix.6.xml
index 01cd1f6..aee2c51 100644
--- a/compatibility_matrices/compatibility_matrix.6.xml
+++ b/compatibility_matrices/compatibility_matrix.6.xml
@@ -508,6 +508,7 @@
         <interface>
             <name>ISharedSecret</name>
             <instance>default</instance>
+            <instance>strongbox</instance>
         </interface>
     </hal>
     <hal format="hidl" optional="true">