diff --git a/packages/backend-core/src/logging/system.ts b/packages/backend-core/src/logging/system.ts
index 9a32b69a9f..d918c6efd6 100644
--- a/packages/backend-core/src/logging/system.ts
+++ b/packages/backend-core/src/logging/system.ts
@@ -45,7 +45,7 @@ export function getSingleFileMaxSizeInfo(totalMaxSize: string) {
     return { size: `${size / 2}${unit}`, totalHistoryFiles: 1 }
   }
 
-  return { size: `1${unit}`, totalHistoryFiles: size }
+  return { size: `1${unit}`, totalHistoryFiles: size - 1 }
 }
 
 export function localFileDestination() {
diff --git a/packages/backend-core/src/logging/tests/system.spec.ts b/packages/backend-core/src/logging/tests/system.spec.ts
index f756d59e2b..b84d8e8456 100644
--- a/packages/backend-core/src/logging/tests/system.spec.ts
+++ b/packages/backend-core/src/logging/tests/system.spec.ts
@@ -19,12 +19,12 @@ describe("system", () => {
     )
 
     it.each([
-      ["5B", "1B", 5],
-      ["17K", "1K", 17],
-      ["21M", "1M", 21],
-      ["3G", "1G", 3],
+      ["5B", "1B", 4],
+      ["17K", "1K", 16],
+      ["21M", "1M", 20],
+      ["3G", "1G", 2],
     ])(
-      "Halving an odd number (%s) returns as many files as size (%s)",
+      "Halving an odd number (%s) returns as many files as size (-1) (%s)",
       (totalValue, expectedMaxSize, totalHistoryFiles) => {
         const result = getSingleFileMaxSizeInfo(totalValue)
         expect(result).toEqual({