diff --git a/arg.h b/extern/arg.h
similarity index 100%
rename from arg.h
rename to extern/arg.h
diff --git a/concat.h b/extern/concat.h
similarity index 100%
rename from concat.h
rename to extern/concat.h
diff --git a/strlcat.h b/extern/strlcat.h
similarity index 100%
rename from strlcat.h
rename to extern/strlcat.h
diff --git a/strlcpy.h b/extern/strlcpy.h
similarity index 100%
rename from strlcpy.h
rename to extern/strlcpy.h
diff --git a/slstatus.c b/slstatus.c
index babcb89..99ef720 100644
--- a/slstatus.c
+++ b/slstatus.c
@@ -26,10 +26,10 @@
 #undef strlcat
 #undef strlcpy
 
-#include "arg.h"
-#include "strlcat.h"
-#include "strlcpy.h"
-#include "concat.h"
+#include "extern/arg.h"
+#include "extern/strlcat.h"
+#include "extern/strlcpy.h"
+#include "extern/concat.h"
 
 struct arg {
 	char *(*func)();