diff --git a/Makefile b/Makefile
index 9ba22d9..0d6c086 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 .PHONY: all clean
 
-HTMLS = $(addprefix html/,problem0001.html problem0002.html problem0003.html problem0004.html problem0005.html problem0006.html problem0007.html problem0008.html problem0009.html problem0010.html problem0012.html problem0014.html)
+HTMLS = $(patsubst %.ipynb,html/%.html,$(wildcard *.ipynb))
 
 all: $(HTMLS)