diff --git a/command/format/diagnostic.go b/command/format/diagnostic.go
index 895876df3..a7e41d923 100644
--- a/command/format/diagnostic.go
+++ b/command/format/diagnostic.go
@@ -172,10 +172,10 @@ func Diagnostic(diag tfdiags.Diagnostic, sources map[string][]byte, color *color
 			sort.Strings(stmts) // FIXME: Should maybe use a traversal-aware sort that can sort numeric indexes properly?
 
 			if len(stmts) > 0 {
-				fmt.Fprint(&buf, color.Color("    [dark_gray]|----------------[reset]\n"))
+				fmt.Fprint(&buf, color.Color("    [dark_gray]├────────────────[reset]\n"))
 			}
 			for _, stmt := range stmts {
-				fmt.Fprintf(&buf, color.Color("    [dark_gray]|[reset] %s\n"), stmt)
+				fmt.Fprintf(&buf, color.Color("    [dark_gray]│[reset] %s\n"), stmt)
 			}
 		}
 
diff --git a/command/format/diagnostic_test.go b/command/format/diagnostic_test.go
index 3895dba6a..ee333eaca 100644
--- a/command/format/diagnostic_test.go
+++ b/command/format/diagnostic_test.go
@@ -94,8 +94,8 @@ Whatever shall we do?
 
   on test.tf line 1:
    1: test [underline]source[reset] code
-    [dark_gray]|----------------[reset]
-    [dark_gray]|[reset] [bold]boop.beep[reset] is "blah"
+    [dark_gray]├────────────────[reset]
+    [dark_gray]│[reset] [bold]boop.beep[reset] is "blah"
 
 Whatever shall we do?
 `,
@@ -127,8 +127,8 @@ Whatever shall we do?
 
   on test.tf line 1:
    1: test [underline]source[reset] code
-    [dark_gray]|----------------[reset]
-    [dark_gray]|[reset] [bold]boop.beep[reset] has a sensitive value
+    [dark_gray]├────────────────[reset]
+    [dark_gray]│[reset] [bold]boop.beep[reset] has a sensitive value
 
 Whatever shall we do?
 `,
@@ -160,8 +160,8 @@ Whatever shall we do?
 
   on test.tf line 1:
    1: test [underline]source[reset] code
-    [dark_gray]|----------------[reset]
-    [dark_gray]|[reset] [bold]boop.beep[reset] is a string, known only after apply
+    [dark_gray]├────────────────[reset]
+    [dark_gray]│[reset] [bold]boop.beep[reset] is a string, known only after apply
 
 Whatever shall we do?
 `,
@@ -193,8 +193,8 @@ Whatever shall we do?
 
   on test.tf line 1:
    1: test [underline]source[reset] code
-    [dark_gray]|----------------[reset]
-    [dark_gray]|[reset] [bold]boop.beep[reset] will be known only after apply
+    [dark_gray]├────────────────[reset]
+    [dark_gray]│[reset] [bold]boop.beep[reset] will be known only after apply
 
 Whatever shall we do?
 `,