diff --git a/Makefile b/Makefile
index 4c665bb..9baad41 100644
--- a/Makefile
+++ b/Makefile
@@ -34,11 +34,6 @@ tags: $(SOURCES)
 $(TARGET): $(OBJS)
 	$(CXX) -o $@ $(CXXFLAGS) $(LDFLAGS) $(OBJS)
 
-
-.PHONY: cclean
-cclean:
-	rm -r build cmake-build-*
-
 print-%: ; @echo '$(subst ','\'',$*=$($*))'
 
 %.o:%.cc
diff --git a/rcpp.cc b/rcpp.cc
index 2c7e204..ff2b805 100644
--- a/rcpp.cc
+++ b/rcpp.cc
@@ -149,6 +149,7 @@ main(int argc, char *argv[])
 	auto regexOptions = std::regex_constants::optimize;
 	if (argc < 4) {
 		std::cerr << "Usage: rcpp pattern files... destination\n";
+		exit(0);
 	}
 
 	auto pattern = std::string(argv[1]);