diff --git a/config.go b/config.go
index 92cb3f9..362583f 100644
--- a/config.go
+++ b/config.go
@@ -12,10 +12,10 @@ type Sensor struct {
 	Alias       string  `yaml:"alias"`
 	HighTemp    float64 `yaml:"hightemp"`
 	LowTemp     float64 `yaml:"lowtemp"`
-	HeatGpio    int32   `yaml:"heatgpio"`
+	HeatGPIO    int32   `yaml:"heatgpio"`
 	HeatPullup  bool    `yaml:"heatpullup"`
 	HeatMinutes int32   `yaml:"heatminutes"`
-	CoolGpio    int32   `yaml:"coolgpio"`
+	CoolGPIO    int32   `yaml:"coolgpio"`
 	CoolPullup  bool    `yaml:"coolpullup"`
 	CoolMinutes int32   `yaml:"coolminutes"`
 }
diff --git a/config_test.go b/config_test.go
index 83ac804..06ca013 100644
--- a/config_test.go
+++ b/config_test.go
@@ -12,10 +12,10 @@ func Test_LoadConfig(t *testing.T) {
 		Alias:       "fermenter",
 		HighTemp:    8,
 		LowTemp:     4,
-		HeatGpio:    5,
+		HeatGPIO:    5,
 		HeatPullup:  true,
 		HeatMinutes: 5,
-		CoolGpio:    17,
+		CoolGPIO:    17,
 		CoolPullup:  false,
 		CoolMinutes: 10}