diff --git a/doc/doxygen.conf.in b/doc/doxygen.conf.in
index 8b123737c..0657c5ca2 100644
--- a/doc/doxygen.conf.in
+++ b/doc/doxygen.conf.in
@@ -534,7 +534,7 @@ WARN_LOGFILE           =
 # directories like "/usr/src/myproject". Separate the files or directories
 # with spaces.
 
-INPUT = @top_srcdir@/src/
+INPUT = @abs_top_srcdir@/src/
 
 # 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