diff --git a/lib/csharp/Makefile.am b/lib/csharp/Makefile.am
index 611405d..a8b275e 100644
--- a/lib/csharp/Makefile.am
+++ b/lib/csharp/Makefile.am
@@ -87,7 +87,7 @@
 clean-local:
 	$(RM) Thrift.dll
 
-precross:
+precross: all-local
 	$(MAKE) -C test/ThriftTest precross
 
 # run csharp tests?