diff --git a/sql-common/client.c b/sql-common/client.c
index 3e5ceb1a738..f8d52e02196 100644
--- a/sql-common/client.c
+++ b/sql-common/client.c
@@ -402,13 +402,19 @@ HANDLE create_shared_memory(MYSQL *mysql,NET *net, uint connect_timeout)
   HANDLE handle_file_map = NULL;
   ulong connect_number;
   char connect_number_char[22], *p;
-  char tmp[64];
+  char *tmp= NULL;
   char *suffix_pos;
   DWORD error_allow = 0;
   DWORD error_code = 0;
   DWORD event_access_rights= SYNCHRONIZE | EVENT_MODIFY_STATE;
   char *shared_memory_base_name = mysql->options.shared_memory_base_name;
 
+  /*
+     get enough space base-name + '_' + longest suffix we might ever send
+   */
+  if (!(tmp= (char *)my_malloc(strlen(shared_memory_base_name) + 32L, MYF(MY_FAE))))
+    goto err;
+
   /*
     The name of event and file-mapping events create agree next rule:
     shared_memory_base_name+unique_part
@@ -551,6 +557,8 @@ err2:
       CloseHandle(handle_file_map);
   }
 err:
+  if (tmp)
+    my_free(tmp, MYF(0));
   if (error_allow)
     error_code = GetLastError();
   if (event_connect_request)
diff --git a/sql/mysqld.cc b/sql/mysqld.cc
index 49d997f391e..afeb3b82a01 100644
--- a/sql/mysqld.cc
+++ b/sql/mysqld.cc
@@ -4420,7 +4420,7 @@ pthread_handler_t handle_connections_shared_memory(void *arg)
   HANDLE event_connect_answer= 0;
   ulong smem_buffer_length= shared_memory_buffer_length + 4;
   ulong connect_number= 1;
-  char tmp[63];
+  char *tmp= NULL;
   char *suffix_pos;
   char connect_number_char[22], *p;
   const char *errmsg= 0;
@@ -4429,6 +4429,12 @@ pthread_handler_t handle_connections_shared_memory(void *arg)
   DBUG_ENTER("handle_connections_shared_memorys");
   DBUG_PRINT("general",("Waiting for allocated shared memory."));
 
+  /*
+     get enough space base-name + '_' + longest suffix we might ever send
+   */
+  if (!(tmp= (char *)my_malloc(strlen(shared_memory_base_name) + 32L, MYF(MY_FAE))))
+    goto error;
+
   if (my_security_attr_create(&sa_event, &errmsg,
                               GENERIC_ALL, SYNCHRONIZE | EVENT_MODIFY_STATE))
     goto error;
@@ -4616,6 +4622,9 @@ errorconn:
 
   /* End shared memory handling */
 error:
+  if (tmp)
+    my_free(tmp, MYF(0));
+
   if (errmsg)
   {
     char buff[180];