diff --git a/c_project_archive_report.mk b/c_project_archive_report.mk
index 1b2100f..a9159ce 100644
--- a/c_project_archive_report.mk
+++ b/c_project_archive_report.mk
@@ -41,7 +41,7 @@ pdf-make:
 	$(MAKE)
 
 pdf-clean:
-	@cd report && \
+	-@cd report && \
 	$(MAKE) clean
 
 clean: pdf-clean