diff --git a/nc_test/Makefile.am b/nc_test/Makefile.am
index 5532ac72a..7817eb076 100644
--- a/nc_test/Makefile.am
+++ b/nc_test/Makefile.am
@@ -100,7 +100,7 @@ EXTRA_DIST += ref_tst_diskless2.cdl CMakeLists.txt
 #MAINTAINERCLEANFILES = test_get.c test_put.c
 
 all:
-	cp $(top_srcdir)/libsrc/ncx.c .
+	cp $(top_builddir)/libsrc/ncx.c .
 
 CLEANFILES += ncx.c