diff --git a/src/terminal.go b/src/terminal.go
index bb1a8ff4..66bef46f 100644
--- a/src/terminal.go
+++ b/src/terminal.go
@@ -1734,8 +1734,10 @@ func (t *Terminal) separatedByBorder() bool {
 
 	// The input section has its own window. Determine which section it is
 	// facing, and check if the border of that section draws a line toward it.
-	if hasHeaderWindow && !t.headerFirst {
-		// Header section
+	if hasHeaderWindow && !t.headerFirst && t.headerBorderShape != tui.BorderInline {
+		// Header section; an inline header is not a separate section, it is
+		// drawn inside the list border, so it falls through to the branches
+		// below
 		return t.borderFacingInput(t.headerBorderShape)
 	}
 	// The header lines section is next to the input section, except in