diff --git a/Makefile b/Makefile
index b1fb581..fe7421e 100644
--- a/Makefile
+++ b/Makefile
@@ -1,10 +1,10 @@
 day1part1:
-	fpc src/day1/part1.p -obuild/day1part1
+	fpc src/day1/part1.pas -obuild/day1part1
 	@echo
 	./build/day1part1
 
 day1part2:
-	fpc src/day1/part2.p -obuild/day1part2
+	fpc src/day1/part2.pas -obuild/day1part2
 	@echo
 	./build/day1part2
 
diff --git a/src/day1/part1.p b/src/day1/part1.pas
similarity index 97%
rename from src/day1/part1.p
rename to src/day1/part1.pas
index 213acfd..a875ea4 100644
--- a/src/day1/part1.p
+++ b/src/day1/part1.pas
@@ -1,5 +1,4 @@
-program HelloWorld;
-uses crt;
+program day1part1;
 
 var
 file_: text;
diff --git a/src/day1/part2.p b/src/day1/part2.pas
similarity index 98%
rename from src/day1/part2.p
rename to src/day1/part2.pas
index 4403d8e..677f374 100644
--- a/src/day1/part2.p
+++ b/src/day1/part2.pas
@@ -1,4 +1,4 @@
-program HelloWorld;
+program day2part2;
 uses sysutils;
 
 var