diff --git a/src/PwmSensor.cpp b/src/PwmSensor.cpp
index f76ea50..7b03e68 100644
--- a/src/PwmSensor.cpp
+++ b/src/PwmSensor.cpp
@@ -199,7 +199,7 @@
         uint32_t value = std::stoi(line);
         return value;
     }
-    catch (std::invalid_argument&)
+    catch (const std::invalid_argument&)
     {
         std::cerr << "Error reading pwm at " << sysPath << "\n";
         // throw if not initial read to be caught by dbus bindings