diff --git a/doc/reference/Makefile.am b/doc/reference/Makefile.am
index 36e97a17b..aebfd76b5 100644
--- a/doc/reference/Makefile.am
+++ b/doc/reference/Makefile.am
@@ -158,7 +158,7 @@ if ENABLE_GTK_DOC
 TESTS_ENVIRONMENT = cd $(srcdir) && \
   DOC_MODULE=$(DOC_MODULE) DOC_MAIN_SGML_FILE=$(DOC_MAIN_SGML_FILE) \
   SRCDIR=$(abs_srcdir) BUILDDIR=$(abs_builddir)
-#TESTS = $(GTKDOC_CHECK)
+TESTS = $(GTKDOC_CHECK)
 endif
 
 -include $(top_srcdir)/git.mk