diff --git a/include/Spectra/LoggerBase.h b/include/Spectra/LoggerBase.h
index d11142f..4a64a15 100644
--- a/include/Spectra/LoggerBase.h
+++ b/include/Spectra/LoggerBase.h
@@ -49,7 +49,7 @@ class LoggerBase
     ///
     virtual ~LoggerBase() {}
 
-    virtual void call_iteration_start();
+    virtual void call_iteration_start() = 0;
     ///
     /// Virtual logging function
     ///