diff --git a/include/haproxy/stick_table-t.h b/include/haproxy/stick_table-t.h
index c89c3ec8e..79fee4897 100644
--- a/include/haproxy/stick_table-t.h
+++ b/include/haproxy/stick_table-t.h
@@ -127,6 +127,7 @@ struct stktable_data_type {
 	int arg_type;     /* type of optional argument, ARG_T_* */
 	uint is_array:1;  /* this is an array of gpc/gpt */
 	uint is_local:1;  /* this is local only and never learned */
+	uint as_is:1;     /* cannot be processed / used with arithmetic operations */
 };
 
 /* stick table keyword type */
diff --git a/src/stick_table.c b/src/stick_table.c
index 91d697b9e..4bf46ef38 100644
--- a/src/stick_table.c
+++ b/src/stick_table.c
@@ -1316,8 +1316,8 @@ int stktable_compatible_sample(struct sample_expr *expr, unsigned long table_typ
  * at run time.
  */
 struct stktable_data_type stktable_data_types[STKTABLE_DATA_TYPES] = {
-	[STKTABLE_DT_SERVER_ID]     = { .name = "server_id",      .std_type = STD_T_SINT  },
-	[STKTABLE_DT_GPT0]          = { .name = "gpt0",           .std_type = STD_T_UINT  },
+	[STKTABLE_DT_SERVER_ID]     = { .name = "server_id",      .std_type = STD_T_SINT, .as_is = 1  },
+	[STKTABLE_DT_GPT0]          = { .name = "gpt0",           .std_type = STD_T_UINT, .as_is = 1  },
 	[STKTABLE_DT_GPC0]          = { .name = "gpc0",           .std_type = STD_T_UINT  },
 	[STKTABLE_DT_GPC0_RATE]     = { .name = "gpc0_rate",      .std_type = STD_T_FRQP, .arg_type = ARG_T_DELAY  },
 	[STKTABLE_DT_CONN_CNT]      = { .name = "conn_cnt",       .std_type = STD_T_UINT  },
@@ -1335,10 +1335,10 @@ struct stktable_data_type stktable_data_types[STKTABLE_DATA_TYPES] = {
 	[STKTABLE_DT_BYTES_OUT_RATE]= { .name = "bytes_out_rate", .std_type = STD_T_FRQP, .arg_type = ARG_T_DELAY },
 	[STKTABLE_DT_GPC1]          = { .name = "gpc1",           .std_type = STD_T_UINT  },
 	[STKTABLE_DT_GPC1_RATE]     = { .name = "gpc1_rate",      .std_type = STD_T_FRQP, .arg_type = ARG_T_DELAY  },
-	[STKTABLE_DT_SERVER_KEY]    = { .name = "server_key",     .std_type = STD_T_DICT  },
+	[STKTABLE_DT_SERVER_KEY]    = { .name = "server_key",     .std_type = STD_T_DICT, .as_is = 1  },
 	[STKTABLE_DT_HTTP_FAIL_CNT] = { .name = "http_fail_cnt",  .std_type = STD_T_UINT  },
 	[STKTABLE_DT_HTTP_FAIL_RATE]= { .name = "http_fail_rate", .std_type = STD_T_FRQP, .arg_type = ARG_T_DELAY  },
-	[STKTABLE_DT_GPT]           = { .name = "gpt",            .std_type = STD_T_UINT, .is_array = 1 },
+	[STKTABLE_DT_GPT]           = { .name = "gpt",            .std_type = STD_T_UINT, .is_array = 1, .as_is = 1  },
 	[STKTABLE_DT_GPC]           = { .name = "gpc",            .std_type = STD_T_UINT, .is_array = 1 },
 	[STKTABLE_DT_GPC_RATE]      = { .name = "gpc_rate",       .std_type = STD_T_FRQP, .is_array = 1, .arg_type = ARG_T_DELAY },
 };