diff --git a/Makefile b/Makefile
index 2c2554f..e50efd8 100644
--- a/Makefile
+++ b/Makefile
@@ -15,5 +15,5 @@ clean:
 	$(RM) -r $(PDFDIR)
 
 $(PDFDIR)/%.pdf: $(SRCDIR)/%.md
-	@mkdir -p $(D)
+	@mkdir -p $(@D)
 	$(PANDOC) $(PANDOCFLAGS) $< -o $@