diff --git a/src/Solar.Api/Services/SolarService.cs b/src/Solar.Api/Services/SolarService.cs
index 5ee17fa..74bc3c0 100644
--- a/src/Solar.Api/Services/SolarService.cs
+++ b/src/Solar.Api/Services/SolarService.cs
@@ -129,7 +129,7 @@ public class SolarService
             {
                 current = (current.Year, current.Month + 1);
             }
-        } while (current.Year < toYear || current.Month < toMonth);
+        } while (current.Year < toYear || (current.Year == toYear && current.Month <= toMonth));
         return new MonthSummariesResponse(results.ToArray());
     }