diff --git a/Documentation/Makefile b/Documentation/Makefile
index 85d3cfa..2edd03b 100644
--- a/Documentation/Makefile
+++ b/Documentation/Makefile
@@ -23,7 +23,7 @@
 .DEFAULT:
 	$(warning The '$(SPHINXBUILD)' command was not found. Make sure you have Sphinx installed and in PATH, or set the SPHINXBUILD make variable to point to the full path of the '$(SPHINXBUILD)' executable.)
 	@echo
-	@./scripts/sphinx-pre-install
+	@$(srctree)/scripts/sphinx-pre-install
 	@echo "  SKIP    Sphinx $@ target."
 
 else # HAVE_SPHINX