diff --git a/apps/tree.c b/apps/tree.c
index 01aabf7d82..31fe0e2d4b 100644
--- a/apps/tree.c
+++ b/apps/tree.c
@@ -1511,7 +1511,7 @@ static bool dirbrowse(char *root, int *dirfilter)
                 else if (global_settings.talk_file == 1) /* files as numbers */
                 {
                     /* try to find a voice ID for the extension, if known */
-                    int j;
+                    unsigned int j;
                     int ext_id = -1; /* default to none */
                     for (j=0; j<sizeof(filetypes)/sizeof(*filetypes); j++)
                     {
diff --git a/uisimulator/common/stubs.c b/uisimulator/common/stubs.c
index b9b0a047e2..78e521b326 100644
--- a/uisimulator/common/stubs.c
+++ b/uisimulator/common/stubs.c
@@ -260,4 +260,11 @@ int talk_number(int n, bool enqueue)
     return 0;
 }
 
+int talk_spell(char* spell, bool enqueue) 
+{
+    (void)spell;
+    (void)enqueue;
+    return 0;
+}
+
 const char* dir_thumbnail_name = ".dirname.mp3";