diff --git a/backend/teco1.c b/backend/teco1.c
index 136f537a8..a0ebc8b2d 100644
--- a/backend/teco1.c
+++ b/backend/teco1.c
@@ -1005,7 +1005,7 @@ attach_scanner (const char *devicename, Teco_Scanner ** devp)
       return SANE_STATUS_INVAL;
     }
 
-  /* Get the page 0x82. It doesn't appear to be usefull yet. */
+  /* Get the page 0x82. It doesn't appear to be useful yet. */
   teco_get_inquiry_82 (dev);
 
   teco_close (dev);
diff --git a/backend/teco1.h b/backend/teco1.h
index 528613f47..a90d9baeb 100644
--- a/backend/teco1.h
+++ b/backend/teco1.h
@@ -293,7 +293,7 @@ struct scanners_supported
 
 /*--------------------------------------------------------------------------*/
 
-/* Define a scanner occurence. */
+/* Define a scanner occurrence. */
 typedef struct Teco_Scanner
 {
   struct Teco_Scanner *next;