diff --git a/esphome/components/gp8403/gp8403.h b/esphome/components/gp8403/gp8403.h
index 972f2ce60c..a19df15515 100644
--- a/esphome/components/gp8403/gp8403.h
+++ b/esphome/components/gp8403/gp8403.h
@@ -6,12 +6,12 @@
 namespace esphome {
 namespace gp8403 {
 
-enum GP8403Voltage {
+enum GP8403Voltage : uint8_t {
   GP8403_VOLTAGE_5V = 0x00,
   GP8403_VOLTAGE_10V = 0x11,
 };
 
-enum GP8403Model {
+enum GP8403Model : uint8_t {
   GP8403,
   GP8413,
 };