diff --git a/pkgconfig/meson.build b/pkgconfig/meson.build
index 23aa5d0e7b..71f38b9536 100644
--- a/pkgconfig/meson.build
+++ b/pkgconfig/meson.build
@@ -1,6 +1,6 @@
 pkgconf = configuration_data()
 
-pkgconf.set('prefix', get_option('prefix'))
+pkgconf.set('prefix', join_paths(get_option('prefix')))
 pkgconf.set('exec_prefix', '${prefix}')
 pkgconf.set('libdir', '${prefix}/@0@'.format(get_option('libdir')))
 pkgconf.set('includedir', '${prefix}/@0@'.format(get_option('includedir')))