diff --git a/src/terminal/actions/property.c b/src/terminal/actions/property.c
index b2b458a..6784b5f 100644
--- a/src/terminal/actions/property.c
+++ b/src/terminal/actions/property.c
@@ -270,8 +270,9 @@
 
 	v3270PropertyAction * action = V3270_PROPERTY_ACTION(object);
 
+	// Boolean actions should act as toggles.
 	if(action->pspec->value_type == G_TYPE_BOOLEAN)
-		return G_VARIANT_TYPE_BOOLEAN;
+		return NULL;
 
 	return G_VARIANT_TYPE_STRING;
 
--
libgit2 0.21.2