diff --git a/Doc/Makefile b/Doc/Makefile
index 3d39766b3cb..fc0d1e4d9a2 100644
--- a/Doc/Makefile
+++ b/Doc/Makefile
@@ -144,7 +144,7 @@ pydoc-topics: build
 
 .PHONY: gettext
 gettext: BUILDER = gettext
-gettext: SPHINXOPTS += '-d build/doctrees-gettext'
+gettext: SPHINXOPTS += -d build/doctrees-gettext
 gettext: build
 
 .PHONY: htmlview