diff --git a/example/asio-example.cpp b/example/asio-example.cpp
index b1e1132..317deb5 100644
--- a/example/asio-example.cpp
+++ b/example/asio-example.cpp
@@ -288,7 +288,7 @@
             message intMsg = conn->call(readyMsg);
             intMsg.read(ready);
         }
-        catch (sdbusplus::exception::SdBusError& e)
+        catch (const sdbusplus::exception::SdBusError& e)
         {
             ready = 0;
             // pause to give the server a chance to start up
diff --git a/include/sdbusplus/asio/object_server.hpp b/include/sdbusplus/asio/object_server.hpp
index 5994c25..43c0795 100644
--- a/include/sdbusplus/asio/object_server.hpp
+++ b/include/sdbusplus/asio/object_server.hpp
@@ -208,7 +208,7 @@
                 {
                     expandCall(yield, mcpy);
                 }
-                catch (sdbusplus::exception::SdBusError& e)
+                catch (const sdbusplus::exception::SdBusError& e)
                 {
                     // Catch D-Bus error explicitly called by method handler
                     err = mcpy.new_method_errno(e.get_errno(), e.get_error());
@@ -637,7 +637,7 @@
 #ifdef __EXCEPTIONS
             }
 
-            catch (sdbusplus::exception_t& e)
+            catch (const sdbusplus::exception_t& e)
             {
                 return sd_bus_error_set(error, e.name(), e.description());
             }
@@ -678,7 +678,7 @@
 #ifdef __EXCEPTIONS
             }
 
-            catch (sdbusplus::exception_t& e)
+            catch (const sdbusplus::exception_t& e)
             {
                 return sd_bus_error_set(error, e.name(), e.description());
             }
@@ -711,7 +711,7 @@
 #ifdef __EXCEPTIONS
             }
 
-            catch (sdbusplus::exception_t& e)
+            catch (const sdbusplus::exception_t& e)
             {
                 return sd_bus_error_set(error, e.name(), e.description());
             }
diff --git a/include/sdbusplus/bus.hpp b/include/sdbusplus/bus.hpp
index 2ffaa82..80ae4c4 100644
--- a/include/sdbusplus/bus.hpp
+++ b/include/sdbusplus/bus.hpp
@@ -347,7 +347,7 @@
         {
             call_noreply(m, timeout_us);
         }
-        catch (exception::SdBusError&)
+        catch (const exception::SdBusError&)
         {
             // Intentionally ignoring these sd_bus errors
         }
diff --git a/include/sdbusplus/sdbuspp_support/server.hpp b/include/sdbusplus/sdbuspp_support/server.hpp
index 74f673a..e72575b 100644
--- a/include/sdbusplus/sdbuspp_support/server.hpp
+++ b/include/sdbusplus/sdbuspp_support/server.hpp
@@ -51,7 +51,7 @@
             std::apply(f, std::move(arg));
         }
     }
-    catch (sdbusplus::internal_exception_t& e)
+    catch (const sdbusplus::internal_exception_t& e)
     {
         return intf->sd_bus_error_set(error, e.name(), e.description());
     }
@@ -124,7 +124,7 @@
         // Indicate reply complete.
         reply.method_return();
     }
-    catch (sdbusplus::internal_exception_t& e)
+    catch (const sdbusplus::internal_exception_t& e)
     {
         return intf->sd_bus_error_set(error, e.name(), e.description());
     }