diff --git a/esphome/components/ds2484/ds2484.cpp b/esphome/components/ds2484/ds2484.cpp
index 7c890ff433..0b36f86874 100644
--- a/esphome/components/ds2484/ds2484.cpp
+++ b/esphome/components/ds2484/ds2484.cpp
@@ -110,9 +110,9 @@ uint8_t DS2484OneWireBus::read8() {
 }
 
 uint64_t DS2484OneWireBus::read64() {
-  uint8_t response = 0;
+  uint64_t response = 0;
   for (uint8_t i = 0; i < 8; i++) {
-    response |= (this->read8() << (i * 8));
+    response |= (static_cast<uint64_t>(this->read8()) << (i * 8));
   }
   return response;
 }