diff --git a/multimedia/libv4l/libv4l.conf b/multimedia/libv4l/libv4l.conf
index 0c82ad01e..b0f1f06cf 100644
--- a/multimedia/libv4l/libv4l.conf
+++ b/multimedia/libv4l/libv4l.conf
@@ -12,4 +12,4 @@
 # GNU General Public License can be found in the file COPYING.
 # --- SDE-COPYRIGHT-NOTE-END ---
 
-var_append makeinstopt ' ' 'PREFIX=$root$prefix'
+var_append makeinstopt ' ' 'PREFIX=$root/$prefix'