diff --git a/mysql-test/suite/rpl/r/rpl_alter.result b/mysql-test/suite/rpl/r/rpl_alter.result
index 2cffa70d778..7be3bc576f3 100644
--- a/mysql-test/suite/rpl/r/rpl_alter.result
+++ b/mysql-test/suite/rpl/r/rpl_alter.result
@@ -14,4 +14,109 @@ select * from mysqltest.t3;
 n
 45
 drop database mysqltest;
+use test;
+#
+# Test bug where ALTER TABLE MODIFY didn't replicate properly
+#
+create table t1 (a int unsigned primary key, b int);
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` int(10) unsigned NOT NULL,
+  `b` int(11) DEFAULT NULL,
+  PRIMARY KEY (`a`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+insert into t1 (a) values (1),((1<<32)-1);
+select * from t1;
+a	b
+1	NULL
+4294967295	NULL
+alter table t1 modify a bigint;
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` bigint(20) NOT NULL DEFAULT '0',
+  `b` int(11) DEFAULT NULL,
+  PRIMARY KEY (`a`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+select * from t1;
+a	b
+1	NULL
+4294967295	NULL
+alter table t1 modify a int unsigned;
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` int(10) unsigned NOT NULL DEFAULT '0',
+  `b` int(11) DEFAULT NULL,
+  PRIMARY KEY (`a`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+select * from t1;
+a	b
+1	NULL
+4294967295	NULL
+alter table t1 modify a bigint unsigned;
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` bigint(20) unsigned NOT NULL DEFAULT '0',
+  `b` int(11) DEFAULT NULL,
+  PRIMARY KEY (`a`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+select * from t1;
+a	b
+1	NULL
+4294967295	NULL
+use test;
+select * from t1;
+a	b
+1	NULL
+4294967295	NULL
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` bigint(20) unsigned NOT NULL DEFAULT '0',
+  `b` int(11) DEFAULT NULL,
+  PRIMARY KEY (`a`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+create table t2 (a int unsigned auto_increment primary key, b int);
+show create table t2;
+Table	Create Table
+t2	CREATE TABLE `t2` (
+  `a` int(10) unsigned NOT NULL AUTO_INCREMENT,
+  `b` int(11) DEFAULT NULL,
+  PRIMARY KEY (`a`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+alter table t2 modify a bigint;
+show create table t2;
+Table	Create Table
+t2	CREATE TABLE `t2` (
+  `a` bigint(20) NOT NULL DEFAULT '0',
+  `b` int(11) DEFAULT NULL,
+  PRIMARY KEY (`a`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+alter table t2 modify a bigint auto_increment;
+show create table t2;
+Table	Create Table
+t2	CREATE TABLE `t2` (
+  `a` bigint(20) NOT NULL AUTO_INCREMENT,
+  `b` int(11) DEFAULT NULL,
+  PRIMARY KEY (`a`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+drop table t1,t2;
+#
+# MDEV-8432:  Slave cannot replicate signed integer-type values
+# with high bit set to 1
+# Test replication when we have int on master and bigint on slave
+#
+create table t1 (a int unsigned primary key, b int);
+SET GLOBAL SLAVE_TYPE_CONVERSIONS='ALL_NON_LOSSY';
+alter table t1 modify a bigint unsigned;
+insert into t1 (a) values (1),((1<<32)-1);
+select * from t1;
+a	b
+1	NULL
+4294967295	NULL
+SET GLOBAL SLAVE_TYPE_CONVERSIONS='';
+drop table t1;
 include/rpl_end.inc
diff --git a/mysql-test/suite/rpl/t/rpl_alter.test b/mysql-test/suite/rpl/t/rpl_alter.test
index 630197f8637..8b8bcfb3d26 100644
--- a/mysql-test/suite/rpl/t/rpl_alter.test
+++ b/mysql-test/suite/rpl/t/rpl_alter.test
@@ -15,4 +15,57 @@ drop database mysqltest;
 sync_slave_with_master;
 
 # End of 4.1 tests
+
+connection master;
+use test;
+
+--echo #
+--echo # Test bug where ALTER TABLE MODIFY didn't replicate properly
+--echo #
+
+create table t1 (a int unsigned primary key, b int);
+show create table t1;
+insert into t1 (a) values (1),((1<<32)-1);
+select * from t1;
+alter table t1 modify a bigint;
+show create table t1;
+select * from t1;
+alter table t1 modify a int unsigned;
+show create table t1;
+select * from t1;
+alter table t1 modify a bigint unsigned;
+show create table t1;
+select * from t1;
+sync_slave_with_master;
+use test;
+select * from t1;
+show create table t1;
+connection master;
+#
+create table t2 (a int unsigned auto_increment primary key, b int);
+show create table t2;
+alter table t2 modify a bigint;
+show create table t2;
+alter table t2 modify a bigint auto_increment;
+show create table t2;
+drop table t1,t2;
+
+--echo #
+--echo # MDEV-8432:  Slave cannot replicate signed integer-type values
+--echo # with high bit set to 1
+--echo # Test replication when we have int on master and bigint on slave
+--echo #
+
+create table t1 (a int unsigned primary key, b int);
+sync_slave_with_master;
+SET GLOBAL SLAVE_TYPE_CONVERSIONS='ALL_NON_LOSSY';
+alter table t1 modify a bigint unsigned;
+connection master;
+insert into t1 (a) values (1),((1<<32)-1);
+sync_slave_with_master;
+select * from t1;
+SET GLOBAL SLAVE_TYPE_CONVERSIONS='';
+connection master;
+drop table t1;
+
 --source include/rpl_end.inc
diff --git a/sql/rpl_utility.cc b/sql/rpl_utility.cc
index e05ad5a8d43..9a20f71f4f7 100644
--- a/sql/rpl_utility.cc
+++ b/sql/rpl_utility.cc
@@ -876,6 +876,7 @@ TABLE *table_def::create_conversion_table(THD *thd, Relay_log_info *rli, TABLE *
   {
     Create_field *field_def=
       (Create_field*) alloc_root(thd->mem_root, sizeof(Create_field));
+    bool unsigned_flag= 0;
     if (field_list.push_back(field_def))
       DBUG_RETURN(NULL);
 
@@ -885,8 +886,7 @@ TABLE *table_def::create_conversion_table(THD *thd, Relay_log_info *rli, TABLE *
     uint32 max_length=
       max_display_length_for_field(type(col), field_metadata(col));
 
-    switch(type(col))
-    {
+    switch(type(col)) {
       int precision;
     case MYSQL_TYPE_ENUM:
     case MYSQL_TYPE_SET:
@@ -925,6 +925,18 @@ TABLE *table_def::create_conversion_table(THD *thd, Relay_log_info *rli, TABLE *
       pack_length= field_metadata(col) & 0x00ff;
       break;
 
+    case MYSQL_TYPE_TINY:
+    case MYSQL_TYPE_SHORT:
+    case MYSQL_TYPE_INT24:
+    case MYSQL_TYPE_LONG:
+    case MYSQL_TYPE_LONGLONG:
+      /*
+        As we don't know if the integer was signed or not on the master,
+        assume we have same sign on master and slave.  This is true when not
+        using conversions so it should be true also when using conversions.
+      */
+      unsigned_flag= ((Field_num*) target_table->field[col])->unsigned_flag;
+      break;
     default:
       break;
     }
@@ -932,12 +944,13 @@ TABLE *table_def::create_conversion_table(THD *thd, Relay_log_info *rli, TABLE *
     DBUG_PRINT("debug", ("sql_type: %d, target_field: '%s', max_length: %d, decimals: %d,"
                          " maybe_null: %d, unsigned_flag: %d, pack_length: %u",
                          type(col), target_table->field[col]->field_name,
-                         max_length, decimals, TRUE, FALSE, pack_length));
+                         max_length, decimals, TRUE, unsigned_flag,
+                         pack_length));
     field_def->init_for_tmp_table(type(col),
                                   max_length,
                                   decimals,
                                   TRUE,         // maybe_null
-                                  FALSE,        // unsigned_flag
+                                  unsigned_flag,
                                   pack_length);
     field_def->charset= target_table->field[col]->charset();
     field_def->interval= interval;