diff --git a/pictures/Makefile b/pictures/Makefile
index d64cfeb..9ad278b 100644
--- a/pictures/Makefile
+++ b/pictures/Makefile
@@ -7,7 +7,10 @@ CONVERT_OPTIONS = -quality 75 -strip -interlace Plane +repage
 
 all: $(THUMBS)
 
-thumb/%.jpg: full/%.jpg
+thumb:
+	mkdir -p thumb
+
+thumb/%.jpg: full/%.jpg thumb
 	convert "$<" \
 		-resize '$(THUMB_DIM)x$(THUMB_DIM)^' \
 		-gravity "$$(./gravityof.sh "$<")" \