diff --git a/compiler/pash_compilation_server.py b/compiler/pash_compilation_server.py
index 9d7f6ad0a..65baeb2cb 100644
--- a/compiler/pash_compilation_server.py
+++ b/compiler/pash_compilation_server.py
@@ -379,6 +379,7 @@ def remove_process(self, process_id):
                 ]
             )
 
+        assert self.running_procs > 0
         self.running_procs -= 1
         if self.running_procs == 0:
             self.unsafe_running = False