diff --git a/src/actor.h b/src/actor.h
index 30c4e842a..93d2834a8 100644
--- a/src/actor.h
+++ b/src/actor.h
@@ -412,6 +412,7 @@ enum ActorRenderFlag
 	RF_INVISIBLE		= 0x8000,	// Don't bother drawing this actor
 	RF_ROLLSPRITE		= 0x40000,	//[marrub]roll the sprite billboard
 	RF_DONTFLIP			= 0x80000,	// Don't flip it when viewed from behind.
+	RF_ROLLCENTER		= 0x100000, // Rotate from the center of sprite instead of offsets
 
 	RF_FORCEYBILLBOARD		= 0x10000,	// [BB] OpenGL only: draw with y axis billboard, i.e. anchored to the floor (overrides gl_billboard_mode setting)
 	RF_FORCEXYBILLBOARD		= 0x20000,	// [BB] OpenGL only: draw with xy axis billboard, i.e. unanchored (overrides gl_billboard_mode setting)
diff --git a/src/thingdef/thingdef_data.cpp b/src/thingdef/thingdef_data.cpp
index b9e6414ff..a86e98566 100644
--- a/src/thingdef/thingdef_data.cpp
+++ b/src/thingdef/thingdef_data.cpp
@@ -270,6 +270,7 @@ static FFlagDef ActorFlagDefs[]=
 	DEFINE_FLAG(RF, FLATSPRITE, AActor, renderflags),
 	DEFINE_FLAG(RF, WALLSPRITE, AActor, renderflags),
 	DEFINE_FLAG(RF, DONTFLIP, AActor, renderflags),
+	DEFINE_FLAG(RF, ROLLCENTER, AActor, renderflags),
 
 	// Bounce flags
 	DEFINE_FLAG2(BOUNCE_Walls, BOUNCEONWALLS, AActor, BounceFlags),