diff --git a/forge-gui-desktop/src/test/java/forge/card/ForgeCardMockTestCase.java b/forge-gui-desktop/src/test/java/forge/card/ForgeCardMockTestCase.java
index 58a53836a6f..260ee45719d 100644
--- a/forge-gui-desktop/src/test/java/forge/card/ForgeCardMockTestCase.java
+++ b/forge-gui-desktop/src/test/java/forge/card/ForgeCardMockTestCase.java
@@ -108,6 +108,10 @@ public class ForgeCardMockTestCase extends PowerMockTestCase {
         String userCustomEditionDir = userCustomDir + "editions" + File.separator;
         Field fUserCustomEditionDir = PowerMockito.field(ForgeConstants.class, "USER_CUSTOM_EDITIONS_DIR");
         fUserCustomEditionDir.set(ForgeConstants.class, userCustomEditionDir);
+        // Lang Dir
+        String langDir = resDir + "languages" + File.separator;
+        Field fLangDir = PowerMockito.field(ForgeConstants.class, "LANG_DIR");
+        fLangDir.set(ForgeConstants.class, langDir);
     }
 
     private void setMock(Localizer mock) {