diff --git a/include/audacity/EffectAutomationParameters.h b/include/audacity/EffectAutomationParameters.h
index a7b99f1c6..bce9bd2dc 100644
--- a/include/audacity/EffectAutomationParameters.h
+++ b/include/audacity/EffectAutomationParameters.h
@@ -286,6 +286,7 @@ public:
       cleaned.Replace(wxT("/"), wxT("_"));
       cleaned.Replace(wxT("\\"), wxT("_"));
       cleaned.Replace(wxT(":"), wxT("_"));
+      cleaned.Replace(wxT("="), wxT("_"));
 
       return cleaned;
    }