diff --git a/Makefile b/Makefile
index 6c13257..a59ac0f 100644
--- a/Makefile
+++ b/Makefile
@@ -62,4 +62,4 @@ utils: ${SRC}/utils.c
 
 .PHONY: clean
 clean:
-	rm build/* bin/*
+	rm build/[^.]* bin/[^.]*
diff --git a/bin/.gitignore b/bin/.gitignore
new file mode 100644
index 0000000..5e7d273
--- /dev/null
+++ b/bin/.gitignore
@@ -0,0 +1,4 @@
+# Ignore everything in this directory
+*
+# Except this file
+!.gitignore
diff --git a/build/.gitignore b/build/.gitignore
new file mode 100644
index 0000000..5e7d273
--- /dev/null
+++ b/build/.gitignore
@@ -0,0 +1,4 @@
+# Ignore everything in this directory
+*
+# Except this file
+!.gitignore