diff --git a/tests/resistance/Makefile.am b/tests/resistance/Makefile.am
index b7f5358b2..6eb7647fc 100644
--- a/tests/resistance/Makefile.am
+++ b/tests/resistance/Makefile.am
@@ -9,6 +9,6 @@ TESTS_ENVIRONMENT = $(SHELL) $(srcdir)/../check.sh $(top_builddir)/src/ngspice
 
 EXTRA_DIST = \
 	$(TESTS)		\
-	$(TESTS:.sh=.out)
+	$(TESTS:.cir=.out)
 
 MAINTAINERCLEANFILES = Makefile.in