diff --git a/installJRMC b/installJRMC
index 2f63239..6a2f93e 100755
--- a/installJRMC
+++ b/installJRMC
@@ -1432,7 +1432,7 @@ main() {
         acquireDeb
         if (( COMPAT_SWITCH )); then
             declare extract_dir && extract_dir="$(mktemp -d)"
-            declare mcdeb_compat="${MCDEB/.deb/compat.deb}"
+            declare mcdeb_compat="${MCDEB/.deb/.compat.deb}"
             pushd "$extract_dir" &>/dev/null || return $?
             ar x "$MCDEB"
             tar -xJf "control.tar.xz"