diff --git a/main/ble.c b/main/ble.c
index da40861..eba7a83 100644
--- a/main/ble.c
+++ b/main/ble.c
@@ -225,7 +225,7 @@ static int barback_ble_char_access(uint16_t conn_handle, uint16_t attr_handle, s
     if(access->write != NULL)
       access->write(idx, value);
   } else if(ctxt->op == BLE_GATT_ACCESS_OP_READ_CHR) {
-    if(access->read != NULL) {
+    if(access->read == NULL) {
       ESP_LOGW(TAG, "Attempted read without defining access.read");
       return 1;
     }