diff --git a/tools/sdbusplus/templates/method.prototype.hpp.mako b/tools/sdbusplus/templates/method.prototype.hpp.mako
index 640e74f..521ff63 100644
--- a/tools/sdbusplus/templates/method.prototype.hpp.mako
+++ b/tools/sdbusplus/templates/method.prototype.hpp.mako
@@ -112,7 +112,7 @@
                 ));
     }
     % for e in method.errors:
-    catch(sdbusplus::${error_namespace(e)}::${error_name(e)}& e)
+    catch(const sdbusplus::${error_namespace(e)}::${error_name(e)}& e)
     {
         return o->_intf->sd_bus_error_set(error, e.name(), e.description());
     }
diff --git a/tools/sdbusplus/templates/property.prototype.hpp.mako b/tools/sdbusplus/templates/property.prototype.hpp.mako
index e99eb7d..34c2f85 100644
--- a/tools/sdbusplus/templates/property.prototype.hpp.mako
+++ b/tools/sdbusplus/templates/property.prototype.hpp.mako
@@ -48,7 +48,7 @@
                 ));
     }
     % for e in property.errors:
-    catch(sdbusplus::${error_namespace(e)}::${error_name(e)}& e)
+    catch(const sdbusplus::${error_namespace(e)}::${error_name(e)}& e)
     {
         return o->_intf->sd_bus_error_set(error, e.name(), e.description());
     }
@@ -99,7 +99,7 @@
                 ));
     }
     % for e in property.errors:
-    catch(sdbusplus::${error_namespace(e)}::${error_name(e)}& e)
+    catch(const sdbusplus::${error_namespace(e)}::${error_name(e)}& e)
     {
         return o->_intf->sd_bus_error_set(error, e.name(), e.description());
     }