diff --git a/source/framework/core/inc/TRestEventProcess.h b/source/framework/core/inc/TRestEventProcess.h
index b94cbe481dbf77df47f2fa3eb171244a1a01c289..914a8bb9056663340596760df5c914029e87f7bf 100644
--- a/source/framework/core/inc/TRestEventProcess.h
+++ b/source/framework/core/inc/TRestEventProcess.h
@@ -168,7 +168,8 @@ class TRestEventProcess : public TRestMetadata {
     virtual void InitFromConfigFile() {
         map<string, string> parameters = GetParametersList();
 
-        for (auto& p : parameters) p.second = fRunInfo->ReplaceMetadataMembers(p.second);
+        for (auto& p : parameters)
+            p.second = ReplaceMathematicalExpressions(fRunInfo->ReplaceMetadataMembers(p.second));
 
         ReadParametersList(parameters);
     }