diff --git a/mysql-test/r/func_str.result b/mysql-test/r/func_str.result
index eb09a746a1c..86c4b8cf0dc 100644
--- a/mysql-test/r/func_str.result
+++ b/mysql-test/r/func_str.result
@@ -624,6 +624,9 @@ Note	1003	select high_priority md5(_latin1'hello') AS `md5('hello')`,sha(_latin1
 SELECT lpad(12345, 5, "#");
 lpad(12345, 5, "#")
 12345
+SELECT conv(71, 10, 36), conv('1Z', 36, 10);
+conv(71, 10, 36)	conv('1Z', 36, 10)
+1Z	71
 create table t1 (id int(1), str varchar(10)) DEFAULT CHARSET=utf8;
 insert into t1 values (1,'aaaaaaaaaa'), (2,'bbbbbbbbbb');
 create table t2 (id int(1), str varchar(10)) DEFAULT CHARSET=utf8;
diff --git a/mysql-test/t/func_str.test b/mysql-test/t/func_str.test
index c9ead51c0a6..1e6d279f721 100644
--- a/mysql-test/t/func_str.test
+++ b/mysql-test/t/func_str.test
@@ -361,6 +361,13 @@ explain extended select md5('hello'), sha('abc'), sha1('abc'), soundex(''), 'moo
 
 SELECT lpad(12345, 5, "#");
 
+#
+# Bug #2972
+#
+ 
+SELECT conv(71, 10, 36), conv('1Z', 36, 10);
+
+
 
 #
 # Bug #3089
diff --git a/strings/ctype-simple.c b/strings/ctype-simple.c
index 719ae14f653..6e7d0b849e2 100644
--- a/strings/ctype-simple.c
+++ b/strings/ctype-simple.c
@@ -262,9 +262,9 @@ long my_strntol_8bit(CHARSET_INFO *cs,
   {
     if (c>='0' && c<='9')
       c -= '0';
-    else if (c>='A' && c<='F')
+    else if (c>='A' && c<='Z')
       c = c - 'A' + 10;
-    else if (c>='a' && c<='f')
+    else if (c>='a' && c<='z')
       c = c - 'a' + 10;
     else
       break;
@@ -384,9 +384,9 @@ ulong my_strntoul_8bit(CHARSET_INFO *cs,
   {
     if (c>='0' && c<='9')
       c -= '0';
-    else if (c>='A' && c<='F')
+    else if (c>='A' && c<='Z')
       c = c - 'A' + 10;
-    else if (c>='a' && c<='f')
+    else if (c>='a' && c<='z')
       c = c - 'a' + 10;
     else
       break;
@@ -499,9 +499,9 @@ longlong my_strntoll_8bit(CHARSET_INFO *cs __attribute__((unused)),
   {
     if (c>='0' && c<='9')
       c -= '0';
-    else if (c>='A' && c<='F')
+    else if (c>='A' && c<='Z')
       c = c - 'A' + 10;
-    else if (c>='a' && c<='f')
+    else if (c>='a' && c<='z')
       c = c - 'a' + 10;
     else
       break;
@@ -622,9 +622,9 @@ ulonglong my_strntoull_8bit(CHARSET_INFO *cs,
   {
     if (c>='0' && c<='9')
       c -= '0';
-    else if (c>='A' && c<='F')
+    else if (c>='A' && c<='Z')
       c = c - 'A' + 10;
-    else if (c>='a' && c<='f')
+    else if (c>='a' && c<='z')
       c = c - 'a' + 10;
     else
       break;