diff --git a/am/guilec b/am/guilec
index ce0711b74..00366d85e 100644
--- a/am/guilec
+++ b/am/guilec
@@ -30,4 +30,6 @@ install-data-hook:
 
 SUFFIXES = .scm .go
 .scm.go:
-	GUILE_AUTO_COMPILE=0 $(top_builddir)/meta/uninstalled-env guile-tools compile -o "$@" "$<"
+	GUILE_AUTO_COMPILE=0					\
+	$(top_builddir)/meta/uninstalled-env			\
+	guile-tools compile -Wunbound-variable -o "$@" "$<"