diff --git a/clean b/clean
index 225afb3..8980cf3 100755
--- a/clean
+++ b/clean
@@ -5,4 +5,4 @@ part="$2"
 day="$(printf '%02d' "$day")"
 
 rm -f ./run ./luac.out
-rm -f "Day${1}/Part${2}.hi" "Day${1}/Part${2}.o"
+rm -f "day${1}/part${2}.hi" "day${1}/part${2}.o"
diff --git a/prepare b/prepare
index 5ae7ae1..ff04c7b 100755
--- a/prepare
+++ b/prepare
@@ -4,11 +4,11 @@ part="$2"
 
 day="$(printf '%02d' "$day")"
 
-if test -f "Day${day}/Part${part}.lua"; then
-	luac -o luac.out "Day${day}/Part${part}.lua"
+if test -f "day${day}/part${part}.lua"; then
+	luac -o luac.out "day${day}/part${part}.lua"
 	printf '#!/bin/sh\nlua luac.out "$@"\n' > run
 	chmod u+x run
-elif test -f "Day${day}/Part${part}.hs"; then
+elif test -f "day${day}/part${part}.hs"; then
 	#stack build
-	stack ghc -- -O3 "Day${day}/Part${part}.hs" -o run
+	stack ghc -- -O3 "day${day}/part${part}.hs" -o run
 fi