diff --git a/glass/src/app/native/cpp/main.cpp b/glass/src/app/native/cpp/main.cpp
index 3e0adf197d..ed47061e62 100644
--- a/glass/src/app/native/cpp/main.cpp
+++ b/glass/src/app/native/cpp/main.cpp
@@ -215,4 +215,6 @@ int main() {
 
   glass::DestroyContext();
   gui::DestroyContext();
+
+  return 0;
 }
diff --git a/outlineviewer/src/main/native/cpp/main.cpp b/outlineviewer/src/main/native/cpp/main.cpp
index 11428f5e68..c67cb5cb07 100644
--- a/outlineviewer/src/main/native/cpp/main.cpp
+++ b/outlineviewer/src/main/native/cpp/main.cpp
@@ -221,4 +221,6 @@ int main() {
 
   glass::DestroyContext();
   gui::DestroyContext();
+
+  return 0;
 }