diff --git a/poetry/installation/executor.py b/poetry/installation/executor.py
index f6c60497fd9..cc00a9d06e1 100644
--- a/poetry/installation/executor.py
+++ b/poetry/installation/executor.py
@@ -124,7 +124,7 @@ def execute(self, operations):  # type: (Operation) -> int
 
                 break
 
-        return self._shutdown
+        return 1 if self._shutdown else 0
 
     def _write(self, operation, line):
         if not self.supports_fancy_output() or not self._should_write_operation(