diff --git a/esphome/components/ltr390/ltr390.cpp b/esphome/components/ltr390/ltr390.cpp
index c1d97758657..5b9f6a1579a 100644
--- a/esphome/components/ltr390/ltr390.cpp
+++ b/esphome/components/ltr390/ltr390.cpp
@@ -113,12 +113,12 @@ void LTR390Component::read_mode_(LTR390MODE mode) {
       this->reg(LTR390_GAIN) = this->gain_als_;
       // Resolution in bits 6:4, rate 0 (fastest); the device slows it to the conversion time
       this->reg(LTR390_MEAS_RATE) = this->res_als_ << 4;
-      int_time = ((uint32_t) RESOLUTIONVALUE[this->res_als_]) * 100;
+      int_time = RESOLUTIONVALUE[this->res_als_] * 100;
       break;
     case LTR390_MODE_UVS:
       this->reg(LTR390_GAIN) = this->gain_uv_;
       this->reg(LTR390_MEAS_RATE) = this->res_uv_ << 4;
-      int_time = ((uint32_t) RESOLUTIONVALUE[this->res_uv_]) * 100;
+      int_time = RESOLUTIONVALUE[this->res_uv_] * 100;
       break;
   }