diff --git a/src/services/checkpoints/__tests__/excludes.spec.ts b/src/services/checkpoints/__tests__/excludes.spec.ts
index acb1c13d40..3a41c346ef 100644
--- a/src/services/checkpoints/__tests__/excludes.spec.ts
+++ b/src/services/checkpoints/__tests__/excludes.spec.ts
@@ -159,6 +159,16 @@ readme.md text
 			expect(excludePatterns).toContain("*.shp") // geospatial
 			expect(excludePatterns).toContain("*.log") // log
 		})
+		it("should include Windows Thumbs.db cache pattern", async () => {
+			// Mock .gitattributes file doesn't exist
+			vi.mocked(fileExistsAtPath).mockResolvedValue(false)
+
+			// Get exclude patterns
+			const excludePatterns = await getExcludePatterns(testWorkspacePath)
+
+			// Verify Windows cache file pattern is included
+			expect(excludePatterns).toContain("Thumbs.db")
+		})
 	})
 
 	describe("getLargeFileAutoExcludePatterns with LFS pre-filtering", () => {
diff --git a/src/services/checkpoints/excludes.ts b/src/services/checkpoints/excludes.ts
index 800866f94f..0867073e40 100644
--- a/src/services/checkpoints/excludes.ts
+++ b/src/services/checkpoints/excludes.ts
@@ -150,7 +150,7 @@ const getCacheFilePatterns = () => [
 	"*.swp",
 	"*.temp",
 	"*.tmp",
-	"*.Thumbs.db",
+	"Thumbs.db",
 ]
 
 const getConfigFilePatterns = () => ["*.env*", "*.local", "*.development", "*.production"]