diff --git a/mysql-test/r/ps.result b/mysql-test/r/ps.result
index 1727c4ddfbe..1d06ff65439 100644
--- a/mysql-test/r/ps.result
+++ b/mysql-test/r/ps.result
@@ -1358,4 +1358,21 @@ EXECUTE stmt USING @a;
 i	j	i	i	j
 DEALLOCATE PREPARE stmt;
 DROP TABLE IF EXISTS t1, t2, t3;
+flush status;
+prepare sq from 'show status like "slow_queries"';
+execute sq;
+Variable_name	Value
+Slow_queries	0
+prepare no_index from 'select 1 from information_schema.tables limit 1';
+execute sq;
+Variable_name	Value
+Slow_queries	0
+execute no_index;
+1
+1
+execute sq;
+Variable_name	Value
+Slow_queries	1
+deallocate prepare no_index;
+deallocate prepare sq;
 End of 5.0 tests.
diff --git a/mysql-test/r/show_check.result b/mysql-test/r/show_check.result
index 762019be313..1ced624b196 100644
--- a/mysql-test/r/show_check.result
+++ b/mysql-test/r/show_check.result
@@ -630,4 +630,19 @@ SHOW TABLES FROM no_such_database;
 ERROR 42000: Unknown database 'no_such_database'
 SHOW COLUMNS FROM no_such_table;
 ERROR 42S02: Table 'test.no_such_table' doesn't exist
+flush status;
+show status like 'slow_queries';
+Variable_name  Value
+Slow_queries 0
+show tables;
+Tables_in_test
+show status like 'slow_queries';
+Variable_name  Value
+Slow_queries 0
+select 1 from information_schema.tables limit 1;
+1
+1
+show status like 'slow_queries';
+Variable_name  Value
+Slow_queries 1
 End of 5.0 tests
diff --git a/mysql-test/r/union.result b/mysql-test/r/union.result
index 12463658bf9..dc174e35c8f 100644
--- a/mysql-test/r/union.result
+++ b/mysql-test/r/union.result
@@ -836,27 +836,27 @@ count(*)
 26
 show status like 'Slow_queries';
 Variable_name	Value
-Slow_queries	1
+Slow_queries	0
 select count(*) from t1 where b=13;
 count(*)
 10
 show status like 'Slow_queries';
 Variable_name	Value
-Slow_queries	3
+Slow_queries	1
 select count(*) from t1 where b=13 union select count(*) from t1 where a=7;
 count(*)
 10
 26
 show status like 'Slow_queries';
 Variable_name	Value
-Slow_queries	5
+Slow_queries	2
 select count(*) from t1 where a=7 union select count(*) from t1 where b=13;
 count(*)
 26
 10
 show status like 'Slow_queries';
 Variable_name	Value
-Slow_queries	7
+Slow_queries	3
 flush status;
 select a from t1 where b not in (1,2,3) union select a from t1 where b not in (4,5,6);
 a
diff --git a/mysql-test/t/ps-master.opt b/mysql-test/t/ps-master.opt
new file mode 100644
index 00000000000..3eb98fc3d6b
--- /dev/null
+++ b/mysql-test/t/ps-master.opt
@@ -0,0 +1 @@
+--log-slow-queries --log-long-format --log-queries-not-using-indexes
diff --git a/mysql-test/t/ps.test b/mysql-test/t/ps.test
index cc239306558..91700fdae95 100644
--- a/mysql-test/t/ps.test
+++ b/mysql-test/t/ps.test
@@ -1410,4 +1410,18 @@ DEALLOCATE PREPARE stmt;
 DROP TABLE IF EXISTS t1, t2, t3;
 
 
+#
+# Bug 19764:  SHOW commands end up in the slow log as table scans
+#
+
+flush status;
+prepare sq from 'show status like "slow_queries"';
+execute sq;
+prepare no_index from 'select 1 from information_schema.tables limit 1';
+execute sq;
+execute no_index;
+execute sq;
+deallocate prepare no_index;
+deallocate prepare sq;
+
 --echo End of 5.0 tests.
diff --git a/mysql-test/t/show_check-master.opt b/mysql-test/t/show_check-master.opt
new file mode 100644
index 00000000000..3eb98fc3d6b
--- /dev/null
+++ b/mysql-test/t/show_check-master.opt
@@ -0,0 +1 @@
+--log-slow-queries --log-long-format --log-queries-not-using-indexes
diff --git a/mysql-test/t/show_check.test b/mysql-test/t/show_check.test
index 07426193dcf..849be577893 100644
--- a/mysql-test/t/show_check.test
+++ b/mysql-test/t/show_check.test
@@ -507,4 +507,16 @@ SHOW TABLES FROM no_such_database;
 SHOW COLUMNS FROM no_such_table;
 
 
+#
+# Bug #19764: SHOW commands end up in the slow log as table scans
+#
+flush status;
+show status like 'slow_queries';
+show tables;
+show status like 'slow_queries';
+# Table scan query, to ensure that slow_queries does still get incremented
+# (mysqld is started with --log-queries-not-using-indexes)
+select 1 from information_schema.tables limit 1;
+show status like 'slow_queries';
+
 --echo End of 5.0 tests
diff --git a/sql/sql_parse.cc b/sql/sql_parse.cc
index 18d048df393..fdbfa71e141 100644
--- a/sql/sql_parse.cc
+++ b/sql/sql_parse.cc
@@ -2159,9 +2159,11 @@ void log_slow_statement(THD *thd)
 
     if ((ulong) (thd->start_time - thd->time_after_lock) >
 	thd->variables.long_query_time ||
-	((thd->server_status &
+        (thd->server_status &
 	  (SERVER_QUERY_NO_INDEX_USED | SERVER_QUERY_NO_GOOD_INDEX_USED)) &&
-	 (specialflag & SPECIAL_LOG_QUERIES_NOT_USING_INDEXES)))
+        (specialflag & SPECIAL_LOG_QUERIES_NOT_USING_INDEXES) &&
+        /* == SQLCOM_END unless this is a SHOW command */
+        thd->lex->orig_sql_command == SQLCOM_END)
     {
       thd->status_var.long_query_count++;
       mysql_slow_log.write(thd, thd->query, thd->query_length, start_of_query);
diff --git a/sql/sql_prepare.cc b/sql/sql_prepare.cc
index 32f0ca6859d..e8025121eb3 100644
--- a/sql/sql_prepare.cc
+++ b/sql/sql_prepare.cc
@@ -2908,6 +2908,12 @@ bool Prepared_statement::execute(String *expanded_query, bool open_cursor)
   stmt_backup.query= thd->query;
   stmt_backup.query_length= thd->query_length;
 
+  /*
+    Save orig_sql_command as we use it to disable slow logging for SHOW
+    commands (see log_slow_statement()).
+  */
+  stmt_backup.lex->orig_sql_command= thd->lex->orig_sql_command;
+
   /*
     At first execution of prepared statement we may perform logical
     transformations of the query tree. Such changes should be performed