diff --git a/quickemu b/quickemu
index 9a0f4cc469..686bd03c88 100755
--- a/quickemu
+++ b/quickemu
@@ -940,7 +940,7 @@ function configure_display() {
     esac
 
     # Configure multiscreen if max_outputs was provided in the .conf file
-    if [ -v max_outputs ]; then
+    if [ -n "${max_outputs}" ]; then
         VIDEO="${VIDEO},max_outputs=${max_outputs}"
     fi