diff --git a/docs/libnm-glib/Makefile.am b/docs/libnm-glib/Makefile.am
index 3d5adfb82c..05fa706c45 100644
--- a/docs/libnm-glib/Makefile.am
+++ b/docs/libnm-glib/Makefile.am
@@ -10,7 +10,7 @@ DOC_MAIN_SGML_FILE=$(DOC_MODULE)-docs.xml
 # The directory containing the source code. Relative to $(srcdir).
 # gtk-doc will search all .c & .h files beneath here for inline comments
 # documenting functions and macros.
-DOC_SOURCE_DIR=../../libnm-glib
+DOC_SOURCE_DIR=$(top_srcdir)/libnm-glib
 
 # Extra options to supply to gtkdoc-scan.
 SCAN_OPTIONS=
diff --git a/docs/libnm-util/Makefile.am b/docs/libnm-util/Makefile.am
index be1bdeebce..8404be56dd 100644
--- a/docs/libnm-util/Makefile.am
+++ b/docs/libnm-util/Makefile.am
@@ -10,7 +10,7 @@ DOC_MAIN_SGML_FILE=$(DOC_MODULE)-docs.sgml
 # The directory containing the source code. Relative to $(srcdir).
 # gtk-doc will search all .c & .h files beneath here for inline comments
 # documenting functions and macros.
-DOC_SOURCE_DIR=../../libnm-util
+DOC_SOURCE_DIR=$(top_srcdir)/libnm-util
 
 # Extra options to supply to gtkdoc-scan.
 SCAN_OPTIONS=--rebuild-types --rebuild-sections