diff --git a/Makefile b/Makefile
index 696bd4781..761255b39 100644
--- a/Makefile
+++ b/Makefile
@@ -74,6 +74,7 @@ repo/spec:
 # Spec
 #
 
+.PHONY: spec
 # Copy JSON Schema, OpenAPI from OCR-D/spec
 spec: repo/spec
 	cp repo/spec/ocrd_api.swagger.yml ocrd/model/yaml/ocrd_oas3.spec.yml