diff --git a/sql/sql_cache.cc b/sql/sql_cache.cc
index 66ac2449519..4f19fa15e6f 100644
--- a/sql/sql_cache.cc
+++ b/sql/sql_cache.cc
@@ -1788,7 +1788,7 @@ Query_cache::send_result_to_client(THD *thd, char *org_sql, uint query_length)
           sql++;
           continue;
         }
-        /* fall trough */
+        /* fall through */
       default:
         break;
       }
diff --git a/storage/maria/ma_search.c b/storage/maria/ma_search.c
index 951850b16a4..0132dc95e5e 100644
--- a/storage/maria/ma_search.c
+++ b/storage/maria/ma_search.c
@@ -745,11 +745,11 @@ void _ma_kpointer(register MARIA_HA *info, register uchar *buff, my_off_t pos)
   case 5: mi_int5store(buff,pos); break;
 #else
   case 7: *buff++=0;
-    /* fall trough */
+    /* fall through */
   case 6: *buff++=0;
-    /* fall trough */
+    /* fall through */
   case 5: *buff++=0;
-    /* fall trough */
+    /* fall through */
 #endif
   case 4: mi_int4store(buff,pos); break;
   case 3: mi_int3store(buff,pos); break;
@@ -881,13 +881,13 @@ void _ma_dpointer(MARIA_SHARE *share, uchar *buff, my_off_t pos)
   case 5: mi_int5store(buff,pos); break;
 #else
   case 8: *buff++=0;
-    /* fall trough */
+    /* fall through */
   case 7: *buff++=0;
-    /* fall trough */
+    /* fall through */
   case 6: *buff++=0;
-    /* fall trough */
+    /* fall through */
   case 5: *buff++=0;
-    /* fall trough */
+    /* fall through */
 #endif
   case 4: mi_int4store(buff,pos); break;
   case 3: mi_int3store(buff,pos); break;
diff --git a/storage/myisam/mi_search.c b/storage/myisam/mi_search.c
index 60a34c641ad..92f28f4e32a 100644
--- a/storage/myisam/mi_search.c
+++ b/storage/myisam/mi_search.c
@@ -607,11 +607,11 @@ void _mi_kpointer(register MI_INFO *info, register uchar *buff, my_off_t pos)
   case 5: mi_int5store(buff,pos); break;
 #else
   case 7: *buff++=0;
-    /* fall trough */
+    /* fall through */
   case 6: *buff++=0;
-    /* fall trough */
+    /* fall through */
   case 5: *buff++=0;
-    /* fall trough */
+    /* fall through */
 #endif
   case 4: mi_int4store(buff,pos); break;
   case 3: mi_int3store(buff,pos); break;
@@ -728,13 +728,13 @@ void _mi_dpointer(MI_INFO *info, uchar *buff, my_off_t pos)
   case 5: mi_int5store(buff,pos); break;
 #else
   case 8: *buff++=0;
-    /* fall trough */
+    /* fall through */
   case 7: *buff++=0;
-    /* fall trough */
+    /* fall through */
   case 6: *buff++=0;
-    /* fall trough */
+    /* fall through */
   case 5: *buff++=0;
-    /* fall trough */
+    /* fall through */
 #endif
   case 4: mi_int4store(buff,pos); break;
   case 3: mi_int3store(buff,pos); break;