diff --git a/inc/tsg_rule.h b/inc/tsg_rule.h
index 4a9020e..f6db9fd 100644
--- a/inc/tsg_rule.h
+++ b/inc/tsg_rule.h
@@ -55,6 +55,6 @@ struct Maat_rule_t *tsg_fetch_deny_rule(Maat_rule_t *result, int result_num);
 
 int tsg_get_method_id(char *method);
 
-int tsg_get_fqdn_category_id(Maat_feather_t maat_feather, char *fqdn, int *category_id, int category_id_num, void *logger, int thread_seq);
+int tsg_get_fqdn_category_id(Maat_feather_t maat_feather, char *fqdn, unsigned int *category_id, int category_id_num, void *logger, int thread_seq);
 
 #endif
diff --git a/src/tsg_rule.cpp b/src/tsg_rule.cpp
index e6780a9..bde65bb 100644
--- a/src/tsg_rule.cpp
+++ b/src/tsg_rule.cpp
@@ -1483,7 +1483,7 @@ int tsg_get_method_id(char *method)
 	return -1;
 }
 
-int tsg_get_fqdn_category_id(Maat_feather_t maat_feather, char *fqdn, int *category_id, int category_id_num, void *logger, int thread_seq)
+int tsg_get_fqdn_category_id(Maat_feather_t maat_feather, char *fqdn, unsigned int *category_id, int category_id_num, void *logger, int thread_seq)
 {
 	int i=0,ret=0;
 	struct _fqdn_category_t *ex_data_array[8]={0};