diff --git a/lib/init-action.js b/lib/init-action.js
index dc49463d7..ff9b72333 100644
--- a/lib/init-action.js
+++ b/lib/init-action.js
@@ -86928,7 +86928,7 @@ async function getOverlayDatabaseMode(codeql, features, languages, sourceRoot, b
   )) {
     const diskUsage = await checkDiskUsage(logger);
     if (diskUsage === void 0 || diskUsage.numAvailableBytes < OVERLAY_MINIMUM_AVAILABLE_DISK_SPACE_BYTES) {
-      const diskSpaceMb = diskUsage === void 0 ? 0 : diskUsage.numAvailableBytes / 1e6;
+      const diskSpaceMb = diskUsage === void 0 ? 0 : Math.round(diskUsage.numAvailableBytes / 1e6);
       overlayDatabaseMode = "none" /* None */;
       useOverlayDatabaseCaching = false;
       logger.info(
diff --git a/src/config-utils.ts b/src/config-utils.ts
index 03d88722f..257257344 100644
--- a/src/config-utils.ts
+++ b/src/config-utils.ts
@@ -693,7 +693,9 @@ export async function getOverlayDatabaseMode(
       diskUsage.numAvailableBytes < OVERLAY_MINIMUM_AVAILABLE_DISK_SPACE_BYTES
     ) {
       const diskSpaceMb =
-        diskUsage === undefined ? 0 : diskUsage.numAvailableBytes / 1_000_000;
+        diskUsage === undefined
+          ? 0
+          : Math.round(diskUsage.numAvailableBytes / 1_000_000);
       overlayDatabaseMode = OverlayDatabaseMode.None;
       useOverlayDatabaseCaching = false;
       logger.info(