diff --git a/runtime/doc/builtin.txt b/runtime/doc/builtin.txt
index 7312177b99..e1d508fd87 100644
--- a/runtime/doc/builtin.txt
+++ b/runtime/doc/builtin.txt
@@ -7392,7 +7392,8 @@ printf({fmt}, {expr1} ...)                                            *printf()*
 <		      1.41
 
 		You will get an overflow error |E1510|, when the field-width
-		or precision will result in a string longer than 6400 chars.
+		or precision will result in a string longer than 1 MB
+		(1024*1024 = 1048576) chars.
 
 							*E1500*
 		You cannot mix positional and non-positional arguments: >vim
diff --git a/runtime/lua/vim/_meta/vimfn.lua b/runtime/lua/vim/_meta/vimfn.lua
index 699975e62a..a69dd3d9b0 100644
--- a/runtime/lua/vim/_meta/vimfn.lua
+++ b/runtime/lua/vim/_meta/vimfn.lua
@@ -6717,7 +6717,8 @@ function vim.fn.prevnonblank(lnum) end
 --- <      1.41
 ---
 --- You will get an overflow error |E1510|, when the field-width
---- or precision will result in a string longer than 6400 chars.
+--- or precision will result in a string longer than 1 MB
+--- (1024*1024 = 1048576) chars.
 ---
 ---           *E1500*
 --- You cannot mix positional and non-positional arguments: >vim
diff --git a/src/nvim/eval.lua b/src/nvim/eval.lua
index 4e7cdbdffd..bb33188649 100644
--- a/src/nvim/eval.lua
+++ b/src/nvim/eval.lua
@@ -8166,7 +8166,8 @@ M.funcs = {
       <      1.41
 
       You will get an overflow error |E1510|, when the field-width
-      or precision will result in a string longer than 6400 chars.
+      or precision will result in a string longer than 1 MB
+      (1024*1024 = 1048576) chars.
 
       					*E1500*
       You cannot mix positional and non-positional arguments: >vim
diff --git a/test/old/testdir/test_format.vim b/test/old/testdir/test_format.vim
index 36795c87ea..c2126f583c 100644
--- a/test/old/testdir/test_format.vim
+++ b/test/old/testdir/test_format.vim
@@ -334,13 +334,13 @@ func Test_printf_pos_errors()
   call CheckLegacyAndVim9Failure(["call printf('%1$*123456789$.*987654321$d', 5)"], "E1510:")
   call CheckLegacyAndVim9Failure(["call printf('%123456789$*1$.*987654321$d', 5)"], "E1510:")
 
-  call CheckLegacyAndVim9Failure(["call printf('%1$*2$.*1$d', 5, 9999)"], "E1510:")
-  call CheckLegacyAndVim9Failure(["call printf('%1$*1$.*2$d', 5, 9999)"], "E1510:")
-  call CheckLegacyAndVim9Failure(["call printf('%2$*3$.*1$d', 5, 9123, 9321)"], "E1510:")
-  call CheckLegacyAndVim9Failure(["call printf('%1$*2$.*3$d', 5, 9123, 9321)"], "E1510:")
-  call CheckLegacyAndVim9Failure(["call printf('%2$*1$.*3$d', 5, 9123, 9312)"], "E1510:")
+  call CheckLegacyAndVim9Failure(["call printf('%1$*2$.*1$d', 5, 9999999)"], "E1510:")
+  call CheckLegacyAndVim9Failure(["call printf('%1$*1$.*2$d', 5, 9999999)"], "E1510:")
+  call CheckLegacyAndVim9Failure(["call printf('%2$*3$.*1$d', 5, 9999123, 9999321)"], "E1510:")
+  call CheckLegacyAndVim9Failure(["call printf('%1$*2$.*3$d', 5, 9999123, 9999321)"], "E1510:")
+  call CheckLegacyAndVim9Failure(["call printf('%2$*1$.*3$d', 5, 9999123, 9999312)"], "E1510:")
 
-  call CheckLegacyAndVim9Failure(["call printf('%1$*2$d', 5, 9999)"], "E1510:")
+  call CheckLegacyAndVim9Failure(["call printf('%1$*2$d', 5, 9999999)"], "E1510:")
 endfunc
 
 func Test_printf_pos_64bit()