diff --git a/src/p_spec.cpp b/src/p_spec.cpp
index 0bd3d9fdb..3185b6c20 100644
--- a/src/p_spec.cpp
+++ b/src/p_spec.cpp
@@ -244,7 +244,7 @@ bool P_ActivateLine (line_t *line, AActor *mo, int side, int activationType, DVe
 
 DEFINE_ACTION_FUNCTION(_Line, Activate)
 {
-	PARAM_SELF_PROLOGUE(line_t);
+	PARAM_SELF_STRUCT_PROLOGUE(line_t);
 	PARAM_POINTER(mo, AActor);
 	PARAM_INT(side);
 	PARAM_INT(activationType);
@@ -253,7 +253,7 @@ DEFINE_ACTION_FUNCTION(_Line, Activate)
 
 DEFINE_ACTION_FUNCTION(_Line, RemoteActivate)
 {
-	PARAM_SELF_PROLOGUE(line_t);
+	PARAM_SELF_STRUCT_PROLOGUE(line_t);
 	PARAM_POINTER(mo, AActor);
 	PARAM_INT(side);
 	PARAM_INT(activationType);