diff --git a/c_project_archive_report.mk b/c_project_archive_report.mk
index 238837a..40c6b58 100644
--- a/c_project_archive_report.mk
+++ b/c_project_archive_report.mk
@@ -16,6 +16,7 @@ EXE     = project
 EXE_EXT = .elf
 
 ARCHIVE_NAME = nom1-nom2
+ARCHIVE_EXT  = tar
 PDF_DIR      = report
 PDF_NEWNAME  = Rapport de projet
 
@@ -45,11 +46,11 @@ pdf-clean:
 	$(MAKE) clean
 
 clean: pdf-clean
-	$(RM) $(OBJETS) "$(EXE)$(EXE_EXT)" "$(ARCHIVE_NAME).tar"
+	$(RM) $(OBJETS) "$(EXE)$(EXE_EXT)" "$(ARCHIVE_NAME).$(ARCHIVE_EXT)"
 
 archive: pdf-make
 	$(MKDIR) "$(ARCHIVE_NAME)"
 	$(CP) "$(SRC_DIR)" "$(INC_DIR)" Makefile README.md \
 	      "$(wildcard $(PDF_DIR)/*.pdf)" "$(ARCHIVE_NAME)"
-	$(TAR) "$(ARCHIVE_NAME).tar" "$(ARCHIVE_NAME)"
+	$(TAR) "$(ARCHIVE_NAME).$(ARCHIVE_EXT)" "$(ARCHIVE_NAME)"
 	$(RM) "$(ARCHIVE_NAME)"