diff --git a/debian/gstreamer-qapt.postinst b/debian/gstreamer-qapt.postinst
index bdbc11e..f470480 100755
--- a/debian/gstreamer-qapt.postinst
+++ b/debian/gstreamer-qapt.postinst
@@ -2,9 +2,11 @@
 
 set -e
 
+DEB_HOST_MULTIARCH=$(dpkg-architecture -qDEB_HOST_MULTIARCH)
+
 update-alternatives --install /usr/bin/gstreamer-codec-install \
 		    gstreamer-codec-install \
-		    /usr/lib/$DPKG_MAINTSCRIPT_ARCH/libexec/qapt-gst-helper 85 || true
+		    /usr/lib/$DEB_HOST_MULTIARCH/libexec/qapt-gst-helper 85 || true
 
 #DEBHELPER#