diff --git a/docs/libs/Makefile.am b/docs/libs/Makefile.am
index aec65a5d09..a79423d8a9 100644
--- a/docs/libs/Makefile.am
+++ b/docs/libs/Makefile.am
@@ -92,7 +92,7 @@ extra_files =
 
 # CFLAGS and LDFLAGS for compiling scan program. Only needed if your app/lib
 # contains GtkObjects/GObjects and you want to document signals and properties.
-GTKDOC_CFLAGS = -I$(top_builddir) $(GST_BASE_CFLAGS) $(GST_CFLAGS) $(GST_DISCOVERER_CFLAGS)
+GTKDOC_CFLAGS = -I$(top_srcdir) $(GST_BASE_CFLAGS) $(GST_CFLAGS) $(GST_DISCOVERER_CFLAGS)
 GTKDOC_LIBS = $(SCANOBJ_DEPS) $(GST_BASE_LIBS) $(GST_LIBS)
 
 GTKDOC_CC=$(LIBTOOL) --tag=CC --mode=compile $(CC)