diff --git a/lib/ava-files.js b/lib/ava-files.js
index e93fe86a8..97c7c20c7 100644
--- a/lib/ava-files.js
+++ b/lib/ava-files.js
@@ -122,33 +122,31 @@ class AvaFiles {
 		this.files = files;
 		this.sources = options.sources || [];
 		this.cwd = options.cwd || process.cwd();
+		this.globCaches = {
+			cache: Object.create(null),
+			statCache: Object.create(null),
+			realpathCache: Object.create(null),
+			symlinks: Object.create(null)
+		};
 
 		autoBind(this);
 	}
 
 	findTestFiles() {
-		return handlePaths(this.files, this.excludePatterns, {
+		return handlePaths(this.files, this.excludePatterns, Object.assign({
 			cwd: this.cwd,
-			cache: Object.create(null),
-			statCache: Object.create(null),
-			realpathCache: Object.create(null),
-			symlinks: Object.create(null),
 			expandDirectories: false,
 			nodir: false
-		});
+		}, this.globCaches));
 	}
 
 	findTestHelpers() {
-		return handlePaths(defaultHelperPatterns(), ['!**/node_modules/**'], {
+		return handlePaths(defaultHelperPatterns(), ['!**/node_modules/**'], Object.assign({
 			cwd: this.cwd,
 			includeUnderscoredFiles: true,
-			cache: Object.create(null),
-			statCache: Object.create(null),
-			realpathCache: Object.create(null),
-			symlinks: Object.create(null),
 			expandDirectories: false,
 			nodir: false
-		});
+		}, this.globCaches));
 	}
 
 	isSource(filePath) {