diff --git a/portproton/preinstall.sh b/portproton/preinstall.sh
index a48c407..cb9dcfe 100644
--- a/portproton/preinstall.sh
+++ b/portproton/preinstall.sh
@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-if [disto=debian]
+if [["${disto}" == "debian"]];
 then
 sudo dpkg --add-architecture i386
 fi
\ No newline at end of file