diff --git a/src/Composer/Cache.php b/src/Composer/Cache.php
index c6e2585aa..27fc28217 100644
--- a/src/Composer/Cache.php
+++ b/src/Composer/Cache.php
@@ -248,6 +248,10 @@ class Cache
             return false;
         }
 
+        if (Platform::isInputCompletionProcess()) {
+            return false;
+        }
+
         return !random_int(0, 50);
     }