diff --git a/src/os.c b/src/os.c
index 66c3ada..246c10f 100644
--- a/src/os.c
+++ b/src/os.c
@@ -33,7 +33,6 @@
 #include "debug.h"
 #include "ddns.h"
 #include "cache.h"
-#include "libite/lite.h"
 
 #define MAXSTRING 1024
 
@@ -421,6 +420,39 @@ static int mkparentdir(char *file)
 	return rc;
 }
 
+static void pidexit(void)
+{
+	if (pidfile_path) {
+		unlink(pidfile_path);
+		free(pidfile_path);
+		pidfile_path = NULL;
+	}
+}
+
+/* Continue using old pidfile fn for Inadyn 1.x series,
+ * incompatible semantics with OpenBSD version. */
+static int old_pidfile(char *file)
+{
+	FILE *fp;
+
+	/* Ignore any errors, we may not be allowed to create the dir,
+	 * but still be able to create/overwrite the pidfile. */
+	mkparentdir(file);
+
+	fp = fopen(file, "w");
+	if (!fp) {
+		logit(LOG_ERR, "Failed creating pidfile %s: %s", file, strerror(errno));
+		return RC_FILE_IO_ACCESS_ERROR;
+	}
+
+	fprintf(fp, "%u\n", getpid());
+	fclose(fp);
+
+	atexit(pidexit);
+
+	return 0;
+}
+
 /* Create pid and cache file repository, make sure we can write to it.  If
  * we are restarted we cannot otherwise make sure we've not already updated
  * the IP -- and the user will be locked-out of their DDNS server provider
@@ -440,8 +472,8 @@ int os_check_perms(void *UNUSED(arg))
 		return RC_FILE_IO_ACCESS_ERROR;
 	}
 
-	/* Not creating a pidfile is OK, the cache file is the critical point. */
-	pidfile(pidfile_path);
+	if (old_pidfile(pidfile_path))
+		logit(LOG_WARNING, "Failed creating pidfile %s: %m", pidfile_path);
 
 	return 0;
 }