diff --git a/mysql-test/r/ctype_ucs.result b/mysql-test/r/ctype_ucs.result
index 811696ef052..1d3deb0b09a 100644
--- a/mysql-test/r/ctype_ucs.result
+++ b/mysql-test/r/ctype_ucs.result
@@ -470,3 +470,13 @@ select s1 from t1 where s1 > 'a' order by s1;
 s1
 b
 c
+drop table t1;
+create table t1(a char(1)) default charset = ucs2;
+insert into t1 values ('a'),('b'),('c');
+alter table t1 modify a char(5);
+select a, hex(a) from t1;
+a	hex(a)
+a	0061
+b	0062
+c	0063
+drop table t1;
diff --git a/mysql-test/t/ctype_ucs.test b/mysql-test/t/ctype_ucs.test
index 188ef571f7e..d9ef91496e9 100644
--- a/mysql-test/t/ctype_ucs.test
+++ b/mysql-test/t/ctype_ucs.test
@@ -303,4 +303,15 @@ DROP TABLE t1;
 create table t1 (s1 char character set `ucs2` collate `ucs2_czech_ci`);
 insert into t1 values ('0'),('1'),('2'),('a'),('b'),('c');
 select s1 from t1 where s1 > 'a' order by s1;
+drop table t1;
+
+#
+# Bug #5081 : UCS2 fields are filled with '0x2020'
+# after extending field length
+#
+create table t1(a char(1)) default charset = ucs2;
+insert into t1 values ('a'),('b'),('c');
+alter table t1 modify a char(5);
+select a, hex(a) from t1;
+drop table t1;
 
diff --git a/ndb/include/kernel/Interpreter.hpp b/ndb/include/kernel/Interpreter.hpp
index 2c282be361c..74399f5732e 100644
--- a/ndb/include/kernel/Interpreter.hpp
+++ b/ndb/include/kernel/Interpreter.hpp
@@ -83,7 +83,7 @@ public:
   static Uint32 LoadConst64(Uint32 Register); // Value in next 2 words
   static Uint32 Add(Uint32 DstReg, Uint32 SrcReg1, Uint32 SrcReg2);
   static Uint32 Sub(Uint32 DstReg, Uint32 SrcReg1, Uint32 SrcReg2);
-  static Uint32 Branch(Uint32 Inst, Uint32 R1, Uint32 R2);
+  static Uint32 Branch(Uint32 Inst, Uint32 Reg1, Uint32 Reg2);
   static Uint32 ExitOK();
 
   /**
@@ -184,8 +184,8 @@ Interpreter::Sub(Uint32 Dcoleg, Uint32 SrcReg1, Uint32 SrcReg2){
 
 inline
 Uint32
-Interpreter::Branch(Uint32 Inst, Uint32 R1, Uint32 R2){
-  return (R1 << 9) + (R2 << 6) + Inst;
+Interpreter::Branch(Uint32 Inst, Uint32 Reg1, Uint32 Reg2){
+  return (Reg1 << 9) + (Reg2 << 6) + Inst;
 }
 
 inline
diff --git a/ndb/include/util/BaseString.hpp b/ndb/include/util/BaseString.hpp
index 8755c13e9bb..a1bb91ea9c5 100644
--- a/ndb/include/util/BaseString.hpp
+++ b/ndb/include/util/BaseString.hpp
@@ -176,7 +176,7 @@ public:
   /**
    * Trim string from <i>delim</i>
    */
-  static char* trim(char * src, const char * delim = " \t");
+  static char* trim(char * src, const char * delim);
 private:
   char* m_chr;
   unsigned m_len;
diff --git a/sql/field_conv.cc b/sql/field_conv.cc
index e98068ef974..d7993939092 100644
--- a/sql/field_conv.cc
+++ b/sql/field_conv.cc
@@ -340,8 +340,10 @@ static void do_cut_string(Copy_field *copy)
 
 static void do_expand_string(Copy_field *copy)
 {
+  CHARSET_INFO *cs= copy->from_field->charset();
   memcpy(copy->to_ptr,copy->from_ptr,copy->from_length);
-  bfill(copy->to_ptr+copy->from_length,copy->to_length-copy->from_length,' ');
+  cs->cset->fill(cs, copy->to_ptr+copy->from_length,
+                     copy->to_length-copy->from_length, ' ');
 }
 
 static void do_varstring(Copy_field *copy)