diff --git a/include/types/proto_http.h b/include/types/proto_http.h
index 0e51412a1..fc8647593 100644
--- a/include/types/proto_http.h
+++ b/include/types/proto_http.h
@@ -534,11 +534,13 @@ struct http_method_name {
 struct http_req_action_kw {
        const char *kw;
        int (*parse)(const char **args, int *cur_arg, struct proxy *px, struct http_req_rule *rule, char **err);
+	int match_pfx;
 };
 
 struct http_res_action_kw {
        const char *kw;
        int (*parse)(const char **args, int *cur_arg, struct proxy *px, struct http_res_rule *rule, char **err);
+	int match_pfx;
 };
 
 struct http_req_action_kw_list {
diff --git a/include/types/proto_tcp.h b/include/types/proto_tcp.h
index a6af2d37e..d34ff035c 100644
--- a/include/types/proto_tcp.h
+++ b/include/types/proto_tcp.h
@@ -65,6 +65,7 @@ struct tcp_action_kw {
 	const char *kw;
 	int (*parse)(const char **args, int *cur_arg, struct proxy *px,
 	             struct tcp_rule *rule, char **err);
+	int match_pfx;
 };
 
 struct tcp_action_kw_list {
diff --git a/src/proto_http.c b/src/proto_http.c
index def5670bb..5b06233c6 100644
--- a/src/proto_http.c
+++ b/src/proto_http.c
@@ -12809,6 +12809,9 @@ struct http_req_action_kw *action_http_req_custom(const char *kw)
 
 		list_for_each_entry(kw_list, &http_req_keywords.list, list) {
 			for (i = 0; kw_list->kw[i].kw != NULL; i++) {
+				if (kw_list->kw[i].match_pfx &&
+				    strncmp(kw, kw_list->kw[i].kw, strlen(kw_list->kw[i].kw)) == 0)
+					return &kw_list->kw[i];
 				if (!strcmp(kw, kw_list->kw[i].kw))
 					return &kw_list->kw[i];
 			}
@@ -12828,6 +12831,9 @@ struct http_res_action_kw *action_http_res_custom(const char *kw)
 
 		list_for_each_entry(kw_list, &http_res_keywords.list, list) {
 			for (i = 0; kw_list->kw[i].kw != NULL; i++) {
+				if (kw_list->kw[i].match_pfx &&
+				    strncmp(kw, kw_list->kw[i].kw, strlen(kw_list->kw[i].kw)) == 0)
+					return &kw_list->kw[i];
 				if (!strcmp(kw, kw_list->kw[i].kw))
 					return &kw_list->kw[i];
 			}
diff --git a/src/proto_tcp.c b/src/proto_tcp.c
index 4a4a806d1..036191b48 100644
--- a/src/proto_tcp.c
+++ b/src/proto_tcp.c
@@ -145,6 +145,9 @@ static struct tcp_action_kw *tcp_req_conn_action(const char *kw)
 
 	list_for_each_entry(kw_list, &tcp_req_conn_keywords, list) {
 		for (i = 0; kw_list->kw[i].kw != NULL; i++) {
+			if (kw_list->kw[i].match_pfx &&
+			    strncmp(kw, kw_list->kw[i].kw, strlen(kw_list->kw[i].kw)) == 0)
+				return &kw_list->kw[i];
 			if (!strcmp(kw, kw_list->kw[i].kw))
 				return &kw_list->kw[i];
 		}
@@ -162,6 +165,9 @@ static struct tcp_action_kw *tcp_req_cont_action(const char *kw)
 
 	list_for_each_entry(kw_list, &tcp_req_cont_keywords, list) {
 		for (i = 0; kw_list->kw[i].kw != NULL; i++) {
+			if (kw_list->kw[i].match_pfx &&
+			    strncmp(kw, kw_list->kw[i].kw, strlen(kw_list->kw[i].kw)) == 0)
+				return &kw_list->kw[i];
 			if (!strcmp(kw, kw_list->kw[i].kw))
 				return &kw_list->kw[i];
 		}
@@ -179,6 +185,9 @@ static struct tcp_action_kw *tcp_res_cont_action(const char *kw)
 
 	list_for_each_entry(kw_list, &tcp_res_cont_keywords, list) {
 		for (i = 0; kw_list->kw[i].kw != NULL; i++) {
+			if (kw_list->kw[i].match_pfx &&
+			    strncmp(kw, kw_list->kw[i].kw, strlen(kw_list->kw[i].kw)) == 0)
+				return &kw_list->kw[i];
 			if (!strcmp(kw, kw_list->kw[i].kw))
 				return &kw_list->kw[i];
 		}