diff --git a/src/main/java/com/reandroid/apk/ApkJsonEncoder.java b/src/main/java/com/reandroid/apk/ApkJsonEncoder.java
index 2b96e21..2591400 100644
--- a/src/main/java/com/reandroid/apk/ApkJsonEncoder.java
+++ b/src/main/java/com/reandroid/apk/ApkJsonEncoder.java
@@ -51,7 +51,7 @@ public class ApkJsonEncoder {
     }
     private void restoreSignatures(File dir, ApkModule apkModule){
         File sigDir = new File(dir, ApkUtil.SIGNATURE_DIR_NAME);
-        if(!sigDir.isFile()){
+        if(!sigDir.isDirectory()){
             return;
         }
         logMessage("Loading signatures ...");
diff --git a/src/main/java/com/reandroid/apk/ApkModuleXmlEncoder.java b/src/main/java/com/reandroid/apk/ApkModuleXmlEncoder.java
index 956fe5b..122d2a9 100644
--- a/src/main/java/com/reandroid/apk/ApkModuleXmlEncoder.java
+++ b/src/main/java/com/reandroid/apk/ApkModuleXmlEncoder.java
@@ -46,7 +46,7 @@ public class ApkModuleXmlEncoder {
     }
     private void restoreSignatures(File dir) throws IOException {
         File sigDir = new File(dir, ApkUtil.SIGNATURE_DIR_NAME);
-        if(!sigDir.isFile()){
+        if(!sigDir.isDirectory()){
             return;
         }
         ApkModule apkModule = getApkModule();