diff --git a/mysql-test/suite/perfschema/r/misc.result b/mysql-test/suite/perfschema/r/misc.result
index d944b4b1d3d..3c0a4a58e08 100644
--- a/mysql-test/suite/perfschema/r/misc.result
+++ b/mysql-test/suite/perfschema/r/misc.result
@@ -11,3 +11,17 @@ create table test.t1 like performance_schema.EVENTS_WAITS_CURRENT;
 ERROR HY000: Invalid performance_schema usage.
 create table performance_schema.t1(a int);
 ERROR 42000: CREATE command denied to user 'root'@'localhost' for table 't1'
+drop table if exists test.ghost;
+create table test.ghost (a int, b int);
+alter table test.ghost add index index_a(a);
+alter table test.ghost add index index_b(b);
+insert into test.ghost values (1, 3);
+insert into test.ghost values (2, 4);
+select * from test.ghost;
+a	b
+1	3
+2	4
+drop table test.ghost;
+select * from performance_schema.FILE_INSTANCES
+where file_name like "%ghost%";
+FILE_NAME	EVENT_NAME	OPEN_COUNT
diff --git a/mysql-test/suite/perfschema/t/misc.test b/mysql-test/suite/perfschema/t/misc.test
index d9b97d8441e..749eccca793 100644
--- a/mysql-test/suite/perfschema/t/misc.test
+++ b/mysql-test/suite/perfschema/t/misc.test
@@ -55,3 +55,24 @@ create table test.t1 like performance_schema.EVENTS_WAITS_CURRENT;
 --error ER_TABLEACCESS_DENIED_ERROR
 create table performance_schema.t1(a int);
 
+#
+# Bug#51447 performance schema evil twin files
+#
+
+--disable_warnings
+drop table if exists test.ghost;
+--enable_warnings
+
+create table test.ghost (a int, b int);
+alter table test.ghost add index index_a(a);
+alter table test.ghost add index index_b(b);
+insert into test.ghost values (1, 3);
+insert into test.ghost values (2, 4);
+select * from test.ghost;
+
+drop table test.ghost;
+
+# Shoud return nothing
+select * from performance_schema.FILE_INSTANCES
+  where file_name like "%ghost%";
+
diff --git a/storage/perfschema/pfs_instr.cc b/storage/perfschema/pfs_instr.cc
index 2ce3a844290..557ec1c14b5 100644
--- a/storage/perfschema/pfs_instr.cc
+++ b/storage/perfschema/pfs_instr.cc
@@ -746,8 +746,23 @@ find_or_create_file(PFS_thread *thread, PFS_file_class *klass,
     }
   }
 
-  if (len >= sizeof(pfs->m_filename))
-    len= sizeof(pfs->m_filename) - 1;
+  /*
+    Normalize the file name to avoid duplicates when using aliases:
+    - absolute or relative paths
+    - symbolic links
+  */
+  char buffer[FN_REFLEN];
+  const char *normalized_filename;
+  int normalized_length;
+
+  /*
+    Ignore errors, the file may not exist.
+    my_realpath always provide a best effort result in buffer.
+  */
+  (void) my_realpath(buffer, filename, MYF(0));
+
+  normalized_filename= buffer;
+  normalized_length= strlen(normalized_filename);
 
   PFS_file **entry;
   uint retry_count= 0;
@@ -755,7 +770,7 @@ find_or_create_file(PFS_thread *thread, PFS_file_class *klass,
 search:
   entry= reinterpret_cast<PFS_file**>
     (lf_hash_search(&filename_hash, thread->m_filename_hash_pins,
-                    filename, len));
+                    normalized_filename, normalized_length));
   if (entry && (entry != MY_ERRPTR))
   {
     pfs= *entry;
@@ -783,9 +798,9 @@ search:
         if (pfs->m_lock.free_to_dirty())
         {
           pfs->m_class= klass;
-          strncpy(pfs->m_filename, filename, len);
-          pfs->m_filename[len]= '\0';
-          pfs->m_filename_length= len;
+          strncpy(pfs->m_filename, normalized_filename, normalized_length);
+          pfs->m_filename[normalized_length]= '\0';
+          pfs->m_filename_length= normalized_length;
           pfs->m_file_stat.m_open_count= 1;
           pfs->m_wait_stat.m_control_flag=
             &flag_events_waits_summary_by_instance;