diff --git a/pass-1/rlocs.c b/pass-1/rlocs.c
index 75d1012..52bdec7 100644
--- a/pass-1/rlocs.c
+++ b/pass-1/rlocs.c
@@ -607,7 +607,7 @@ ssize_t rlocs_decrypt( struct rlocs *reg, struct rloc *x, struct rloc *y, unsign
         goto fail;
     }
     
-    if ( !EVP_DecryptUpdate( &entry->ctx, dest, &outl, data, data_len ) ) {
+    if ( !EVP_DecryptUpdate( &entry->ctx, dest, &outl, data + 16, data_len - 16 ) ) {
         warn( "EVP_DecryptUpdate() failed" );
         goto fail;
     }