diff --git a/lib/openmsx/share/scripts/headless.tcl b/lib/openmsx/share/scripts/headless.tcl
index cccadaa..4dd20e3 100644
--- a/lib/openmsx/share/scripts/headless.tcl
+++ b/lib/openmsx/share/scripts/headless.tcl
@@ -60,7 +60,7 @@ if {[info exists ::env(RENDERER)] && ([string trim $::env(RENDERER)] != "")} {
 }
 
 if {[info exists ::env(HEADLESS)] && ([string trim $::env(HEADLESS)] != "on")} {
-	if {[catch {set renderer $boot_env_renderer_type} err_msg]} {
+	if {[catch {set renderer $headless_renderer_type} err_msg]} {
 		puts stderr "error: env.HEADLESS value $err_msg"
 		exit 1
 	}