diff --git a/Makefile.am b/Makefile.am
index d043b91..972fecb 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -215,6 +215,6 @@ haddock:
 		cat docextra/tock-docs.m4 $$x | m4 -P >$${x}_ && mv $${x}_ $$x; \
 	done
 
-TAGS: $(tock_SOURCES_hs)
-	hasktags -e $(tock_SOURCES_hs)
+TAGS: $(tocktest_SOURCES)
+	hasktags -e $(tocktest_SOURCES)