diff --git a/mysql-test/main/func_format.result b/mysql-test/main/func_format.result
index eb0ee1d9644..c1b7389bfdf 100644
--- a/mysql-test/main/func_format.result
+++ b/mysql-test/main/func_format.result
@@ -248,7 +248,7 @@ format_bytes(1024 * 1024 - 200)
 
 SELECT format_bytes(1024 * 1024 - 1);
 format_bytes(1024 * 1024 - 1)
-1024.00 KiB
+1.00 MiB
 
 SELECT format_bytes(1024 * 1024);
 format_bytes(1024 * 1024)
@@ -264,7 +264,7 @@ format_bytes(1024 * 1024 + 200)
 
 SELECT format_bytes(1024 * 1024 * 1024 - 1);
 format_bytes(1024 * 1024 * 1024 - 1)
-1024.00 MiB
+1.00 GiB
 
 SELECT format_bytes(1024 * 1024 * 1024);
 format_bytes(1024 * 1024 * 1024)
@@ -276,7 +276,7 @@ format_bytes(1024 * 1024 * 1024 + 1)
 
 SELECT format_bytes(1024 * 1024 * 1024 * 1024 - 1);
 format_bytes(1024 * 1024 * 1024 * 1024 - 1)
-1024.00 GiB
+1.00 TiB
 
 SELECT format_bytes(1024 * 1024 * 1024 * 1024);
 format_bytes(1024 * 1024 * 1024 * 1024)
@@ -288,7 +288,7 @@ format_bytes(1024 * 1024 * 1024 * 1024 + 1)
 
 SELECT format_bytes(1024 * 1024 * 1024 * 1024 * 1024 - 1);
 format_bytes(1024 * 1024 * 1024 * 1024 * 1024 - 1)
-1024.00 TiB
+1.00 PiB
 
 SELECT format_bytes(1024 * 1024 * 1024 * 1024 * 1024);
 format_bytes(1024 * 1024 * 1024 * 1024 * 1024)
diff --git a/sql/item_strfunc.cc b/sql/item_strfunc.cc
index ef1c29731d0..4c0d79212ec 100644
--- a/sql/item_strfunc.cc
+++ b/sql/item_strfunc.cc
@@ -6161,7 +6161,10 @@ String *Item_func_format_bytes::val_str_ascii(String *)
   if (null_value)
     return 0;
 
-  double bytes_abs= fabs(bytes);
+  /*
+    snprintf below uses %4.2f, so 1023.99 MiB should be shown as 1.00 GiB
+  */
+  double bytes_abs= fabs(bytes)/1023.995*1024;
 
   constexpr uint64_t kib{1024};
   constexpr uint64_t mib{1024 * kib};