diff --git a/Makefile b/Makefile
index 735d342a79eb5..a6ee500e48d6b 100644
--- a/Makefile
+++ b/Makefile
@@ -385,6 +385,7 @@ endif
 
 	# Set .jl sources as read-only to match package directories
 	find $(DESTDIR)$(datarootdir)/julia/base -type f -name \*.jl -exec chmod 0444 '{}' \;
+	find $(DESTDIR)$(datarootdir)/julia/stdlib -type f -name \*.jl -exec chmod 0444 '{}' \;
 	find $(DESTDIR)$(datarootdir)/julia/test -type f -name \*.jl -exec chmod 0444 '{}' \;
 
 	# Copy documentation