diff --git a/doc/CSApprox.txt b/doc/CSApprox.txt
index dea2848..f482793 100644
--- a/doc/CSApprox.txt
+++ b/doc/CSApprox.txt
@@ -188,13 +188,15 @@ g:CSApprox_approximator_function            *g:CSApprox_approximator_function*
     references.
 
 g:CSApprox_redirfallback                            *g:CSApprox_redirfallback*
-    As of Vim 7.2.018, there is a bug in the Vim function synIDattr() that
-    stops it from correctly reporting information for the 'guisp' attribute.
-    CSApprox includes a workaround for this problem, as well as a test that
-    ought to disable this workaround once synIDattr() is working properly.
+    Until Vim 7.2.052, there was a bug in the Vim function synIDattr() that
+    made it impossible to determine syntax information about the |guisp|
+    attribute.  CSApprox includes a workaround for this problem, as well as a
+    test that ought to disable this workaround if synIDattr() works properly.
     If this test should happen to give improper results somehow, the user can
     force the behavior with this variable.  When set to 1, the workaround will
-    always be used, and when set to 0, synIDattr() is blindly used.
+    always be used, and when set to 0, synIDattr() is blindly used.  Needless
+    to say, if this automatic detection should ever fail, the author would
+    like to be notified!
 
 ==============================================================================
 4. Rationale/Design                                          *csapprox-design*
diff --git a/plugin/CSApprox.vim b/plugin/CSApprox.vim
index f4853b5..6e91a7a 100644
--- a/plugin/CSApprox.vim
+++ b/plugin/CSApprox.vim
@@ -149,25 +149,15 @@ endfunction
 " {>1} Collect info for the set highlights
 
 " {>2} Determine if synIDattr is usable
-" As of 7.2.018, synIDattr() can't be used to check 'guisp', and no official
-" patch has been released despite my suggesting one.  So, in an attempt to be
-" forward compatible, I've included a test to see if synIDattr() works
-" properly.  If synIDattr() works properly, we'll use it to check the 'guisp'
-" attribute, otherwise we'll fall back onto using :redir and checking the
-" output of :highlight.  This test can be overridden by setting the global
-" variable g:CSApprox_redirfallback to 1 (to force use of :redir) or to 0 (to
-" force use of synIDattr()).
+" synIDattr() couldn't support 'guisp' until 7.2.052.  This function returns
+" true if :redir is needed to find the 'guisp' attribute, false if synIDattr()
+" is functional.  This test can be overridden by setting the global variable
+" g:CSApprox_redirfallback to 1 (to force use of :redir) or to 0 (to force use
+" of synIDattr()).
 function! s:NeedRedirFallback()
   if !exists("g:CSApprox_redirfallback")
-    hi CSApproxTest guisp=Red gui=standout
-    if synIDattr(hlID('CSApproxTest'), 'sp', 'gui') == '1'
-      " We requested the 'sp' attribute, but vim thought we wanted 'standout'
-      " So, reporting of the guisp attribute is broken.  Fall back on :redir
-      let g:CSApprox_redirfallback=1
-    else
-      " Reporting guisp works, use synIDattr
-      let g:CSApprox_redirfallback=0
-    endif
+    let g:CSApprox_redirfallback = (v:version == 702 && !has('patch52'))
+                                 \  || v:version < 702
   endif
   return g:CSApprox_redirfallback
 endfunction