diff --git a/client/mysql_upgrade.c b/client/mysql_upgrade.c
index f7e9a14b33e..190bb2383e9 100644
--- a/client/mysql_upgrade.c
+++ b/client/mysql_upgrade.c
@@ -373,7 +373,7 @@ static void find_tool(char *tool_executable_name, const char *tool_name,
   }
   else
   {
-    size_t len;
+    int len;
 
     /*
       mysql_upgrade was run absolutely or relatively.  We can find a sibling
diff --git a/mysys/base64.c b/mysys/base64.c
index f7d9c8b0d09..ab66715c929 100644
--- a/mysys/base64.c
+++ b/mysys/base64.c
@@ -223,7 +223,7 @@ base64_decode(const char *src_base, size_t len,
     The variable 'i' is set to 'len' when padding has been read, so it
     does not actually reflect the number of bytes read from 'src'.
    */
-  return i != len ? -1 : (uint) (d - dst_base);
+  return i != len ? -1 : (int) (d - dst_base);
 }
 
 
diff --git a/sql/log_event.cc b/sql/log_event.cc
index a222534e8b7..dc886aa3309 100644
--- a/sql/log_event.cc
+++ b/sql/log_event.cc
@@ -1289,7 +1289,6 @@ void Log_event::print_header(IO_CACHE* file,
                     ptr[0], ptr[1], ptr[2], ptr[3], ptr[4], ptr[5], ptr[6],
                     ptr[7], ptr[8], ptr[9], ptr[10], ptr[11], ptr[12], ptr[13],
                     ptr[14], ptr[15], ptr[16], ptr[17], ptr[18]);
-      DBUG_ASSERT(bytes_written >= 0);
       DBUG_ASSERT(static_cast<size_t>(bytes_written) < sizeof(emit_buf));
       my_b_write(file, (uchar*) emit_buf, bytes_written);
       ptr += LOG_EVENT_MINIMAL_HEADER_LEN;
@@ -1320,7 +1319,6 @@ void Log_event::print_header(IO_CACHE* file,
                       "# %8.8lx %-48.48s |%16s|\n",
                       (unsigned long) (hexdump_from + (i & 0xfffffff0)),
                       hex_string, char_string);
-        DBUG_ASSERT(bytes_written >= 0);
         DBUG_ASSERT(static_cast<size_t>(bytes_written) < sizeof(emit_buf));
 	my_b_write(file, (uchar*) emit_buf, bytes_written);
 	hex_string[0]= 0;
@@ -1340,7 +1338,6 @@ void Log_event::print_header(IO_CACHE* file,
                     "# %8.8lx %-48.48s |%s|\n",
                     (unsigned long) (hexdump_from + (i & 0xfffffff0)),
                     hex_string, char_string);
-      DBUG_ASSERT(bytes_written >= 0);
       DBUG_ASSERT(static_cast<size_t>(bytes_written) < sizeof(emit_buf));
       my_b_write(file, (uchar*) emit_buf, bytes_written);
     }
diff --git a/sql/sql_cache.cc b/sql/sql_cache.cc
index 25907d4ec20..32faeae9dcc 100644
--- a/sql/sql_cache.cc
+++ b/sql/sql_cache.cc
@@ -1114,7 +1114,7 @@ def_week_frmt: %lu, in_trans: %d, autocommit: %d",
     {
       memcpy(thd->query+thd->query_length+1, thd->db, thd->db_length);
       DBUG_PRINT("qcache", ("database: %s  length: %u",
-			    thd->db, thd->db_length)); 
+			    thd->db, (unsigned) thd->db_length)); 
     }
     else
     {
@@ -1307,7 +1307,7 @@ Query_cache::send_result_to_client(THD *thd, char *sql, uint query_length)
   {
     memcpy(sql+query_length+1, thd->db, thd->db_length);
     DBUG_PRINT("qcache", ("database: '%s'  length: %u",
-			  thd->db, thd->db_length));
+			  thd->db, (unsigned)thd->db_length));
   }
   else
   {
diff --git a/sql/sql_servers.cc b/sql/sql_servers.cc
index b1c856c87aa..f8a8dea18ff 100644
--- a/sql/sql_servers.cc
+++ b/sql/sql_servers.cc
@@ -1290,8 +1290,8 @@ FOREIGN_SERVER *get_server_by_name(MEM_ROOT *mem, const char *server_name,
                                                (uchar*) server_name,
                                                server_name_length)))
   {
-    DBUG_PRINT("info", ("server_name %s length %d not found!",
-                        server_name, server_name_length));
+    DBUG_PRINT("info", ("server_name %s length %u not found!",
+                        server_name, (unsigned) server_name_length));
     server= (FOREIGN_SERVER *) NULL;
   }
   /* otherwise, make copy of server */
diff --git a/sql/sql_view.cc b/sql/sql_view.cc
index 96448f7e5c2..65157ae4255 100644
--- a/sql/sql_view.cc
+++ b/sql/sql_view.cc
@@ -61,7 +61,8 @@ static void make_unique_view_field_name(Item *target,
   char *name= (target->orig_name ?
                target->orig_name :
                target->name);
-  size_t name_len, attempt;
+  size_t name_len;
+  uint attempt;
   char buff[NAME_LEN+1];
   List_iterator_fast<Item> itc(item_list);
 
diff --git a/storage/csv/transparent_file.cc b/storage/csv/transparent_file.cc
index a200fa6ac36..fad7cd796e5 100644
--- a/storage/csv/transparent_file.cc
+++ b/storage/csv/transparent_file.cc
@@ -82,7 +82,7 @@ char Transparent_file::get_value(off_t offset)
   size_t bytes_read;
 
   /* check boundaries */
-  if ((lower_bound <= offset) && (offset < upper_bound))
+  if ((lower_bound <= offset) && (((my_off_t) offset) < upper_bound))
     return buff[offset - lower_bound];
 
   VOID(my_seek(filedes, offset, MY_SEEK_SET, MYF(0)));
@@ -95,7 +95,7 @@ char Transparent_file::get_value(off_t offset)
   upper_bound= lower_bound + bytes_read;
 
   /* end of file */
-  if (upper_bound == offset)
+  if (upper_bound == (my_off_t) offset)
     return 0;
 
   return buff[0];