diff --git a/docs/reference/api/Makefile.am b/docs/reference/api/Makefile.am
index 60796875..68029cfb 100644
--- a/docs/reference/api/Makefile.am
+++ b/docs/reference/api/Makefile.am
@@ -34,7 +34,7 @@ IGNORE_HFILES = \
 
 # CFLAGS and LDFLAGS for compiling scan program. Only needed
 # if $(DOC_MODULE).types is non-empty.
-INCLUDES = \
+AM_CPPFLAGS = \
 	-I$(srcdir) \
 	-I$(top_srcdir) \
 	-I$(top_builddir) \
diff --git a/docs/reference/libmm-glib/Makefile.am b/docs/reference/libmm-glib/Makefile.am
index ad0f151c..e2abdbf5 100644
--- a/docs/reference/libmm-glib/Makefile.am
+++ b/docs/reference/libmm-glib/Makefile.am
@@ -33,7 +33,7 @@ IGNORE_HFILES = \
 
 # CFLAGS and LDFLAGS for compiling scan program. Only needed
 # if $(DOC_MODULE).types is non-empty.
-INCLUDES = \
+AM_CPPFLAGS = \
 	-I$(srcdir) \
 	-I$(top_srcdir) \
 	-I$(top_builddir) \