1 files changed, 3 insertions, 0 deletions
diff --git a/tests/libsample/expression.cpp b/tests/libsample/expression.cpp
index d93d47f01..f6eedaa77 100644
--- a/tests/libsample/expression.cpp
+++ b/tests/libsample/expression.cpp
@@ -118,6 +118,9 @@ std::string Expression::toString() const
         case GreaterThan:
             op = '<';
             break;
+        case None: // just to avoid the compiler warning
+        default:
+            break;
     }
     result += op;
     result += m_operand2->toString();