diff --git a/stdlib/Makefile b/stdlib/Makefile
index 3224cff78..47bd5568a 100644
--- a/stdlib/Makefile
+++ b/stdlib/Makefile
@@ -21,7 +21,7 @@ Buffer.o: List.o
 STM.o: List.o Fun.o
 
 %.o: %.lama
-	LAMA=../runtime $(LAMAC) -I . -c $<
+	LAMA=../runtime $(LAMAC) -g -I . -c $<
 
 clean:
 	rm -Rf *.s *.o *.i *~