diff --git a/Doxyfile.vty.in b/Doxyfile.vty.in
index 57f19ad..527cdb2 100644
--- a/Doxyfile.vty.in
+++ b/Doxyfile.vty.in
@@ -610,7 +610,7 @@
 # directories like "/usr/src/myproject". Separate the files or directories
 # with spaces.
 
-INPUT                  = include/osmocom/vty src/vty
+INPUT                  = @srcdir@/include/osmocom/vty @srcdir@/src/vty
 
 # This tag can be used to specify the character encoding of the source files
 # that doxygen parses. Internally doxygen uses the UTF-8 encoding, which is