diff --git a/src/iri_base_driver.cpp b/src/iri_base_driver.cpp
index 71c008e7ee9bf38f0a990be8055a3ee210579621..99a129d3afcb02be689a3bf8c21424de32a1108c 100644
--- a/src/iri_base_driver.cpp
+++ b/src/iri_base_driver.cpp
@@ -168,6 +168,7 @@ std::string IriBaseDriver::getStateName(void)
     case iri_base_driver::CLOSED: return std::string("closed");
     case iri_base_driver::OPENED: return std::string("opened");
     case iri_base_driver::RUNNING: return std::string("running");
+    default: return std::string("default value: not_possible");
   }
 }