diff --git a/src/DIRAC/RequestManagementSystem/Agent/RequestExecutingAgent.py b/src/DIRAC/RequestManagementSystem/Agent/RequestExecutingAgent.py
index 87618a6739b..749b899ed27 100644
--- a/src/DIRAC/RequestManagementSystem/Agent/RequestExecutingAgent.py
+++ b/src/DIRAC/RequestManagementSystem/Agent/RequestExecutingAgent.py
@@ -192,7 +192,7 @@ def putAllRequests(self):
         :param self: self reference
         """
         self.log.info("putAllRequests: will put back requests", f"{len(self.__requestCache)}")
-        for requestID in self.__requestCache.keys():
+        for requestID in list(self.__requestCache.keys()):
             reset = self.putRequest(requestID)
             if not reset["OK"]:
                 self.log.error("Failed to put request", reset["Message"])