diff --git a/lib/bitmap.c b/lib/bitmap.c
index 5d25403..d4b3a6d 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -665,13 +665,8 @@
 
 int bitmap_parselist(const char *bp, unsigned long *maskp, int nmaskbits)
 {
-	char *nl  = strchr(bp, '\n');
-	int len;
-
-	if (nl)
-		len = nl - bp;
-	else
-		len = strlen(bp);
+	char *nl  = strchrnul(bp, '\n');
+	int len = nl - bp;
 
 	return __bitmap_parselist(bp, len, 0, maskp, nmaskbits);
 }