diff --git a/PlantBox.Client/PlantBox.Client/Forms/Plant/HistoricPage.xaml.cs b/PlantBox.Client/PlantBox.Client/Forms/Plant/HistoricPage.xaml.cs
index 2a87f02..1fc5bfa 100644
--- a/PlantBox.Client/PlantBox.Client/Forms/Plant/HistoricPage.xaml.cs
+++ b/PlantBox.Client/PlantBox.Client/Forms/Plant/HistoricPage.xaml.cs
@@ -101,7 +101,7 @@ namespace PlantBox.Client.Forms.Plant
             uint count;
             float step;
             string labelFormat;
-            string valueSpecifier;
+            string valueFormat;
 
             switch (viewModel.HistoricDuration.Interval)
             {
@@ -148,15 +148,15 @@ namespace PlantBox.Client.Forms.Plant
             {
                 case CaptorType.Humidity:
                     values = historicEntries.Humidities;
-                    valueSpecifier = "{0:F1} %";
+                    valueFormat = "{0:F1} %";
                     break;
                 case CaptorType.Luminosity:
                     values = historicEntries.Luminosities;
-                    valueSpecifier = "{0:F0} lux";
+                    valueFormat = "{0:F0} lux";
                     break;
                 case CaptorType.Temperature:
                     values = historicEntries.Temperatures;
-                    valueSpecifier = "{0:F1} °C";
+                    valueFormat = "{0:F1} °C";
                     break;
                 default:
                     throw new InvalidOperationException();
@@ -174,7 +174,7 @@ namespace PlantBox.Client.Forms.Plant
                 entries[index] = new Entry((float)value.Value)
                 {
                     Label = value.Date.ToString(labelFormat),
-                    ValueLabel = string.Format(valueSpecifier, value.Value),
+                    ValueLabel = string.Format(valueFormat, value.Value),
                     Color = colors[index]
                 };