diff --git a/tools/helpers/src/main/kotlin/DependencyDownloader.kt b/tools/helpers/src/main/kotlin/DependencyDownloader.kt
index 1b341ddd410..6b20e973616 100644
--- a/tools/helpers/src/main/kotlin/DependencyDownloader.kt
+++ b/tools/helpers/src/main/kotlin/DependencyDownloader.kt
@@ -49,7 +49,10 @@ class DependencyDownloader(dependenciesRoot: File, val properties: Properties, v
 
         val cachedDependencies = DependencyFile(cacheDirectory, ".cached")
         val extractedDependencies = DependencyFile(dependenciesDirectory, ".extracted")
-        if (extractedDependencies.contains(depName) && depDir.exists()) {
+        if (extractedDependencies.contains(depName) &&
+                depDir.exists() &&
+                depDir.isDirectory &&
+                depDir.list().isNotEmpty()) {
             return
         }