diff --git a/mysql-test/r/partition_myisam.result b/mysql-test/r/partition_myisam.result
index 57228c8d9a0..97bcc11495c 100644
--- a/mysql-test/r/partition_myisam.result
+++ b/mysql-test/r/partition_myisam.result
@@ -239,3 +239,12 @@ a
 DROP TABLE t1;
 # Should not be any files left here
 # End of bug#30102 test.
+# Test of post-push fix for bug#11766249/59316
+CREATE TABLE t1 (a INT, b VARCHAR(255), PRIMARY KEY (a))
+ENGINE = MyISAM
+PARTITION BY RANGE (a)
+(PARTITION p0 VALUES LESS THAN (0) MAX_ROWS=100,
+PARTITION p1 VALUES LESS THAN (100) MAX_ROWS=100,
+PARTITION pMax VALUES LESS THAN MAXVALUE);
+INSERT INTO t1 VALUES (1, "Partition p1, first row");
+DROP TABLE t1;
diff --git a/mysql-test/suite/parts/inc/partition_fail.inc b/mysql-test/suite/parts/inc/partition_fail.inc
index f433712e284..dd79cdf1dc8 100644
--- a/mysql-test/suite/parts/inc/partition_fail.inc
+++ b/mysql-test/suite/parts/inc/partition_fail.inc
@@ -23,6 +23,7 @@ DROP TABLE t1;
 --eval $create_statement
 --eval $insert_statement
 --echo # State before failure
+--replace_result #p# #P# #sp# #SP#
 --list_files $DATADIR/test
 SHOW CREATE TABLE t1;
 --sorted_result
@@ -32,6 +33,7 @@ LOCK TABLE t1 WRITE;
 --eval $fail_statement
 --enable_abort_on_error
 --echo # State after failure
+--replace_result #p# #P# #sp# #SP#
 --list_files $DATADIR/test
 SHOW CREATE TABLE t1;
 --sorted_result
diff --git a/mysql-test/t/partition_myisam.test b/mysql-test/t/partition_myisam.test
index 37d4a071fb9..c3766430275 100644
--- a/mysql-test/t/partition_myisam.test
+++ b/mysql-test/t/partition_myisam.test
@@ -1,5 +1,4 @@
--- source include/have_partition.inc
-
+--source include/have_partition.inc
 --disable_warnings
 DROP TABLE IF EXISTS t1, t2;
 --enable_warnings
@@ -171,3 +170,13 @@ DROP TABLE t1;
 --list_files $MYSQLD_DATADIR/test t1*
 --list_files $MYSQLD_DATADIR/test t2*
 --echo # End of bug#30102 test.
+
+--echo # Test of post-push fix for bug#11766249/59316
+CREATE TABLE t1 (a INT, b VARCHAR(255), PRIMARY KEY (a))
+ENGINE = MyISAM
+PARTITION BY RANGE (a)
+(PARTITION p0 VALUES LESS THAN (0) MAX_ROWS=100,
+ PARTITION p1 VALUES LESS THAN (100) MAX_ROWS=100,
+ PARTITION pMax VALUES LESS THAN MAXVALUE);
+INSERT INTO t1 VALUES (1, "Partition p1, first row");
+DROP TABLE t1;
diff --git a/sql/ha_partition.cc b/sql/ha_partition.cc
index c82b96f4fc4..754d5dc99cf 100644
--- a/sql/ha_partition.cc
+++ b/sql/ha_partition.cc
@@ -2739,7 +2739,7 @@ int ha_partition::open(const char *name, int mode, uint test_if_locked)
                       (PARTITION_ENABLED_TABLE_FLAGS));
   while (*(++file))
   {
-    DBUG_ASSERT(ref_length >= (*file)->ref_length);
+    /* MyISAM can have smaller ref_length for partitions with MAX_ROWS set */
     set_if_bigger(ref_length, ((*file)->ref_length));
     /*
       Verify that all partitions have the same set of table flags.
@@ -4089,19 +4089,16 @@ end_dont_reset_start_part:
 void ha_partition::position(const uchar *record)
 {
   handler *file= m_file[m_last_part];
+  uint pad_length;
   DBUG_ENTER("ha_partition::position");
 
   file->position(record);
   int2store(ref, m_last_part);
-  memcpy((ref + PARTITION_BYTES_IN_POS), file->ref,
-	 (ref_length - PARTITION_BYTES_IN_POS));
+  memcpy((ref + PARTITION_BYTES_IN_POS), file->ref, file->ref_length);
+  pad_length= m_ref_length - PARTITION_BYTES_IN_POS - file->ref_length;
+  if (pad_length)
+    memset((ref + PARTITION_BYTES_IN_POS + file->ref_length), 0, pad_length);
 
-#ifdef SUPPORTING_PARTITION_OVER_DIFFERENT_ENGINES
-#ifdef HAVE_purify
-  bzero(ref + PARTITION_BYTES_IN_POS + ref_length,
-        max_ref_length-ref_length);
-#endif /* HAVE_purify */
-#endif
   DBUG_VOID_RETURN;
 }