diff --git a/src/testdir/dumps/Test_smooth_ins_lines.dump b/src/testdir/dumps/Test_smooth_ins_lines.dump
new file mode 100644
index 0000000..a085452
--- /dev/null
+++ b/src/testdir/dumps/Test_smooth_ins_lines.dump
@@ -0,0 +1,6 @@
+|<+0#4040ff13#ffffff0@2|l+0#0000000&|o|t|s| |o|f| |t|e|x|t| |i|n| |o|n|e| |l|i|n|e> @12
+|l|i|n|e| |t|w|o| @31
+|l|i|n|e| |t|h|r|e@1| @29
+|l|i|n|e| |f|o|u|r| @30
+|l|i|n|e| |f|i|v|e| @30
+@22|1|,|6|8| @9|A|l@1| 
diff --git a/src/testdir/test_scroll_opt.vim b/src/testdir/test_scroll_opt.vim
index bab1e08..da19127 100644
--- a/src/testdir/test_scroll_opt.vim
+++ b/src/testdir/test_scroll_opt.vim
@@ -587,7 +587,7 @@
 endfunc
 
 " this was dividing by zero
-func Test_smoothscrol_zero_width()
+func Test_smoothscroll_zero_width()
   CheckScreendump
 
   let lines =<< trim END
@@ -613,5 +613,30 @@
   call StopVimInTerminal(buf)
 endfunc
 
+" this was unnecessarily inserting lines
+func Test_smoothscroll_ins_lines()
+  CheckScreendump
+
+  let lines =<< trim END
+      set wrap
+      set smoothscroll
+      set scrolloff=0
+      set conceallevel=2
+      call setline(1, [
+        \'line one' .. 'with lots of text in one line '->repeat(2),
+        \'line two',
+        \'line three',
+        \'line four',
+        \'line five'
+      \])
+  END
+  call writefile(lines, 'XSmoothScrollInsLines', 'D')
+  let buf = RunVimInTerminal('-S XSmoothScrollInsLines', #{rows: 6, cols: 40})
+
+  call term_sendkeys(buf, "\<C-E>gjgk")
+  call VerifyScreenDump(buf, 'Test_smooth_ins_lines', {})
+
+  call StopVimInTerminal(buf)
+endfunc
 
 " vim: shiftwidth=2 sts=2 expandtab