diff --git a/src/ex_eval.c b/src/ex_eval.c
index d80500e..4e38e96 100644
--- a/src/ex_eval.c
+++ b/src/ex_eval.c
@@ -1201,9 +1201,10 @@
 								& CSF_FUNC_DEF;
 
 		// Any variables defined in the previous round are no longer
-		// visible.  Keep the first one, it is the loop variable that
-		// we reuse every time around.
-		for (i = cstack->cs_script_var_len[cstack->cs_idx] + 1;
+		// visible.  Keep the first one for ":for", it is the loop
+		// variable that we reuse every time around.
+		for (i = cstack->cs_script_var_len[cstack->cs_idx]
+					  + (eap->cmdidx == CMD_while ? 0 : 1);
 					       i < si->sn_var_vals.ga_len; ++i)
 		{
 		    svar_T	*sv = ((svar_T *)si->sn_var_vals.ga_data) + i;
diff --git a/src/testdir/test_vim9_script.vim b/src/testdir/test_vim9_script.vim
index fe9abe4..ca5d7be 100644
--- a/src/testdir/test_vim9_script.vim
+++ b/src/testdir/test_vim9_script.vim
@@ -3083,6 +3083,21 @@
   endwhile
 enddef
 
+def Test_while_loop_in_script()
+  var lines =<< trim END
+      vim9script
+      var result = ''
+      var cnt = 0
+      while cnt < 3
+        var s = 'v' .. cnt
+        result ..= s
+        cnt += 1
+      endwhile
+      assert_equal('v0v1v2', result)
+  END
+  CheckScriptSuccess(lines)
+enddef
+
 def Test_while_loop_fails()
   CheckDefFailure(['while xxx'], 'E1001:')
   CheckDefFailure(['endwhile'], 'E588:')
diff --git a/src/version.c b/src/version.c
index bd41147..3851e80 100644
--- a/src/version.c
+++ b/src/version.c
@@ -758,6 +758,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3649,
+/**/
     3648,
 /**/
     3647,