diff --git a/modules/operserv/os_mode.cpp b/modules/operserv/os_mode.cpp
index 38b45db29..7e9e12b33 100644
--- a/modules/operserv/os_mode.cpp
+++ b/modules/operserv/os_mode.cpp
@@ -39,7 +39,8 @@ public:
 		{
 			bool all = params.size() > 2 && params[2].equals_ci("ALL");
 
-			for (const auto &[mode, data] : c->GetModes())
+			auto cmodes = c->GetModes();
+			for (const auto &[mode, data] : cmodes)
 				c->RemoveMode(c->WhoSends(), mode, data.value, false);
 
 			if (!c)