diff --git a/UI/window-basic-settings.cpp b/UI/window-basic-settings.cpp
index 0aa04a7ec..17fd6b396 100644
--- a/UI/window-basic-settings.cpp
+++ b/UI/window-basic-settings.cpp
@@ -2612,7 +2612,7 @@ void OBSBasicSettings::SaveFormat(QComboBox *combo)
 
 		char *comma = strchr(&extStr[0], ',');
 		if (comma)
-			comma = 0;
+			*comma = 0;
 
 		config_set_string(main->Config(), "AdvOut", "FFExtension",
 				extStr.c_str());