diff --git a/modules/libmar/src/mar_read.c b/modules/libmar/src/mar_read.c
index 378eaea88..241d0c08e 100644
--- a/modules/libmar/src/mar_read.c
+++ b/modules/libmar/src/mar_read.c
@@ -29,7 +29,7 @@ static uint32_t mar_hash_name(const char *name) {
   return val % TABLESIZE;
 }
 
-static int mar_insert_item(MarFile *mar, const char *name, int namelen,
+static int mar_insert_item(MarFile *mar, const char *name, uint32_t namelen,
                            uint32_t offset, uint32_t length, uint32_t flags) {
   MarItem *item, *root;
   uint32_t hash;