diff --git a/src/thingdef/thingdef_properties.cpp b/src/thingdef/thingdef_properties.cpp
index d60cda823..80ee6c22f 100644
--- a/src/thingdef/thingdef_properties.cpp
+++ b/src/thingdef/thingdef_properties.cpp
@@ -1435,7 +1435,7 @@ DEFINE_PROPERTY(spriterotation, F, Actor)
 //==========================================================================
 //
 //==========================================================================
-DEFINE_PROPERTY(visibleangles, Ff, Actor)
+DEFINE_PROPERTY(visibleangles, FF, Actor)
 {
 	PROP_DOUBLE_PARM(visstart, 0);
 	PROP_DOUBLE_PARM(visend, 1);
@@ -1446,7 +1446,7 @@ DEFINE_PROPERTY(visibleangles, Ff, Actor)
 //==========================================================================
 //
 //==========================================================================
-DEFINE_PROPERTY(visiblepitch, Ff, Actor)
+DEFINE_PROPERTY(visiblepitch, FF, Actor)
 {
 	PROP_DOUBLE_PARM(visstart, 0);
 	PROP_DOUBLE_PARM(visend, 1);