diff --git a/src/filesystem/__tests__/lib.test.ts b/src/filesystem/__tests__/lib.test.ts
index bfe8987bfd..2ff098e0af 100644
--- a/src/filesystem/__tests__/lib.test.ts
+++ b/src/filesystem/__tests__/lib.test.ts
@@ -65,8 +65,10 @@ describe('Lib Functions', () => {
       });
 
       it('handles negative numbers', () => {
-        // Negative numbers will result in NaN for the log calculation
-        expect(formatSize(-1024)).toContain('NaN');
+        // Negative numbers should return '0 B' as file sizes cannot be negative
+        expect(formatSize(-1)).toBe('0 B');
+        expect(formatSize(-1024)).toBe('0 B');
+        expect(formatSize(-1000000)).toBe('0 B');
         expect(formatSize(-0)).toBe('0 B');
       });
 
diff --git a/src/filesystem/lib.ts b/src/filesystem/lib.ts
index 240ca0d476..5fa9287663 100644
--- a/src/filesystem/lib.ts
+++ b/src/filesystem/lib.ts
@@ -43,7 +43,7 @@ export interface SearchResult {
 // Pure Utility Functions
 export function formatSize(bytes: number): string {
   const units = ['B', 'KB', 'MB', 'GB', 'TB'];
-  if (bytes === 0) return '0 B';
+  if (bytes <= 0) return '0 B';
   
   const i = Math.floor(Math.log(bytes) / Math.log(1024));