diff --git a/make/project.conf b/make/project.conf
index 2531b0c..4cc7d08 100644
--- a/make/project.conf
+++ b/make/project.conf
@@ -13,6 +13,9 @@ jw-maintainer = jan
 [build]
 libname = none
 
+[pkg.requires.os]
+run = python-magic
+
 [pkg.requires.jw]
 devel = jw-python-run = VERSION-REVISION, jw-build-devel = VERSION
 build = jw-build-devel