diff --git a/code/game/g_items.c b/code/game/g_items.c
index 26439830..f6d84cf7 100644
--- a/code/game/g_items.c
+++ b/code/game/g_items.c
@@ -953,8 +953,8 @@ void G_RunItem( gentity_t *ent ) {
 	int			contents;
 	int			mask;
 
-	// if groundentity has been set to -1, it may have been pushed off an edge
-	if ( ent->s.groundEntityNum == -1 ) {
+	// if its groundentity has been set to none, it may have been pushed off an edge
+	if ( ent->s.groundEntityNum == ENTITYNUM_NONE ) {
 		if ( ent->s.pos.trType != TR_GRAVITY ) {
 			ent->s.pos.trType = TR_GRAVITY;
 			ent->s.pos.trTime = level.time;
diff --git a/code/game/g_mover.c b/code/game/g_mover.c
index 7919e6fa..b7948777 100644
--- a/code/game/g_mover.c
+++ b/code/game/g_mover.c
@@ -164,7 +164,7 @@ qboolean	G_TryPushingEntity( gentity_t *check, gentity_t *pusher, vec3_t move, v
 
 	// may have pushed them off an edge
 	if ( check->s.groundEntityNum != pusher->s.number ) {
-		check->s.groundEntityNum = -1;
+		check->s.groundEntityNum = ENTITYNUM_NONE;
 	}
 
 	block = G_TestEntityPosition( check );
@@ -189,7 +189,7 @@ qboolean	G_TryPushingEntity( gentity_t *check, gentity_t *pusher, vec3_t move, v
 	VectorCopy( (pushed_p-1)->angles, check->s.apos.trBase );
 	block = G_TestEntityPosition (check);
 	if ( !block ) {
-		check->s.groundEntityNum = -1;
+		check->s.groundEntityNum = ENTITYNUM_NONE;
 		pushed_p--;
 		return qtrue;
 	}
diff --git a/code/qcommon/q_shared.h b/code/qcommon/q_shared.h
index fc667c07..c0262666 100644
--- a/code/qcommon/q_shared.h
+++ b/code/qcommon/q_shared.h
@@ -1277,7 +1277,7 @@ typedef struct entityState_s {
 	int		otherEntityNum;	// shotgun sources, etc
 	int		otherEntityNum2;
 
-	int		groundEntityNum;	// -1 = in air
+	int		groundEntityNum;	// ENTITYNUM_NONE = in air
 
 	int		constantLight;	// r + (g<<8) + (b<<16) + (intensity<<24)
 	int		loopSound;		// constantly loop this sound