diff --git a/docs/Makefile.am b/docs/Makefile.am
index 860b989897..2e5d1c8710 100644
--- a/docs/Makefile.am
+++ b/docs/Makefile.am
@@ -1,16 +1,14 @@
-if ENABLE_PLUGIN_DOCS
-PLUGINS_DOCS_DIRS = plugins
-else
-PLUGINS_DOCS_DIRS =
-endif
-
 if ENABLE_GTK_DOC
-GTK_DOC_DIRS = $(PLUGINS_DOCS_DIRS)
+if ENABLE_PLUGIN_DOCS
+PLUGIN_DOCS_DIRS = plugins
 else
-GTK_DOC_DIRS =
+PLUGIN_DOCS_DIRS =
+endif
+else
+PLUGIN_DOCS_DIRS = plugins
 endif
 
-SUBDIRS = libs $(GTK_DOC_DIRS)
+SUBDIRS = libs $((PLUGIN_DOCS_DIRS)
 DIST_SUBDIRS = libs plugins
 
 EXTRA_DIST = \