diff --git a/src/thingdef/thingdef_properties.cpp b/src/thingdef/thingdef_properties.cpp
index 3ec4c624d5..7bf72fc485 100644
--- a/src/thingdef/thingdef_properties.cpp
+++ b/src/thingdef/thingdef_properties.cpp
@@ -682,6 +682,15 @@ DEFINE_PROPERTY(scale, F, Actor)
 	defaults->Scale.X = defaults->Scale.Y = id;
 }
 
+//==========================================================================
+//
+//==========================================================================
+DEFINE_PROPERTY(flatangle, F, Actor)
+{
+	PROP_DOUBLE_PARM(id, 0);
+	defaults->FlatAngle = id;
+}
+
 //==========================================================================
 //
 //==========================================================================
diff --git a/wadsrc/static/actors/actor.txt b/wadsrc/static/actors/actor.txt
index f47a1d87ac..8794debde9 100644
--- a/wadsrc/static/actors/actor.txt
+++ b/wadsrc/static/actors/actor.txt
@@ -35,6 +35,7 @@ ACTOR Actor native //: Thinker
 	BloodType "Blood", "BloodSplatter", "AxeBlood"
 	ExplosionDamage 128
 	MissileHeight 32
+	FlatAngle 0
 	
 
 	// Functions