diff --git a/l2/Makefile b/l2/Makefile
index a3eed42..f81118e 100644
--- a/l2/Makefile
+++ b/l2/Makefile
@@ -8,7 +8,7 @@ all: dirs 1 2 3 4
 dirs:
 	mkdir -p $(BIN)
 
-%: %.l
+%: %.lex
 	$(FLEX) -o $(BIN)/$@.lex.yy.c $<
 	$(CC) $(BIN)/$@.lex.yy.c -lfl -lm -o $(BIN)/$@