diff --git a/extensions/openpower-pels/data_interface.hpp b/extensions/openpower-pels/data_interface.hpp
index 2469bb5..fc902a0 100644
--- a/extensions/openpower-pels/data_interface.hpp
+++ b/extensions/openpower-pels/data_interface.hpp
@@ -362,7 +362,7 @@
                 {
                     func(_hostUp);
                 }
-                catch (std::exception& e)
+                catch (const std::exception& e)
                 {
                     using namespace phosphor::logging;
                     log<level::ERR>("A host state change callback threw "