diff --git a/src/feature.c b/src/feature.c
index 0edf9433ac..1c8de4e94c 100644
--- a/src/feature.c
+++ b/src/feature.c
@@ -42,9 +42,9 @@ static uint32_t FeatureHashFunc(HashListTable *ht, void *data,
 {
     FeatureEntryType *f = (FeatureEntryType *)data;
     uint32_t hash = 0;
-    int len = strlen(f->feature);
+    size_t len = strlen(f->feature);
 
-    for (int i = 0; i < len; i++)
+    for (size_t i = 0; i < len; i++)
         hash += u8_tolower((unsigned char)f->feature[i]);
 
     return (hash % ht->array_size);
@@ -55,8 +55,8 @@ static char FeatureHashCompareFunc(void *data1, uint16_t datalen1,
 {
     FeatureEntryType *f1 = (FeatureEntryType *)data1;
     FeatureEntryType *f2 = (FeatureEntryType *)data2;
-    int len1 = 0;
-    int len2 = 0;
+    size_t len1 = 0;
+    size_t len2 = 0;
 
     if (f1 == NULL || f2 == NULL)
         return 0;