diff --git a/test/unit/tools/test_toolbox.py b/test/unit/tools/test_toolbox.py
index 6acd49783cc..89f690a49eb 100644
--- a/test/unit/tools/test_toolbox.py
+++ b/test/unit/tools/test_toolbox.py
@@ -195,10 +195,12 @@ class ToolBoxTestCase(BaseToolBoxTestCase):
         macro_path = tool._macro_paths[0]
         with open(macro_path, 'w') as macro_out:
             macro_out.write(SIMPLE_MACRO.substitute(tool_version="3.0"))
-        time.sleep(1.5)
-        tool = self.app.toolbox.get_tool("tool_with_macro")
 
-        assert tool.version == "3.0"
+        def check_tool_macro():
+            tool = self.app.toolbox.get_tool("tool_with_macro")
+            assert tool.version == "3.0"
+
+        self._try_until_no_errors(check_tool_macro)
 
     def test_tool_reload_for_broken_tool(self):
         self._init_tool(filename="simple_tool.xml", version="1.0")