diff --git a/src/info.c b/src/info.c
index 2343b81e3..4aaff79e1 100644
--- a/src/info.c
+++ b/src/info.c
@@ -24673,7 +24673,7 @@ mobjinfo_t mobjinfo[NUMMOBJTYPES] =
 		0,              // mass
 		0,              // damage
 		sfx_None,       // activesound
-		MF_SPECIAL|MF_NOCLIP|MF_NOGRAVITY|MF_DONTENCOREMAP|MF_APPLYTERRAIN, // flags
+		MF_SPECIAL|MF_NOCLIP|MF_NOCLIPHEIGHT|MF_NOGRAVITY|MF_DONTENCOREMAP|MF_APPLYTERRAIN|MF_NOSQUISH, // flags
 		S_NULL          // raisestate
 	},
 
diff --git a/src/objects/hyudoro.c b/src/objects/hyudoro.c
index b5fa87429..32c190c92 100644
--- a/src/objects/hyudoro.c
+++ b/src/objects/hyudoro.c
@@ -22,6 +22,7 @@
 #include "../s_sound.h"
 #include "../g_game.h"
 #include "../k_hitlag.h"
+#include "../p_slopes.h"
 
 enum {
 	HYU_PATROL,
@@ -150,6 +151,14 @@ project_hyudoro (mobj_t *hyu)
 	hyu->angle = angle + ANGLE_90;
 
 	sine_bob(hyu, angle, FRACUNIT);
+
+	hyu->z = P_GetZAt(center->standingslope, hyu->x, hyu->y,
+			P_GetMobjGround(center));
+
+	if (P_IsObjectFlipped(hyu))
+	{
+		hyu->z -= hyu->height;
+	}
 }
 
 static void
@@ -570,6 +579,12 @@ Obj_HyudoroDeploy (mobj_t *master)
 	center->angle = master->angle;
 	Obj_InitHyudoroCenter(center, master);
 
+	// Update floorz to the correct position by indicating
+	// that it should be recalculated by P_MobjThinker.
+	center->floorz = master->z;
+	center->ceilingz = master->z + master->height;
+	center->z = P_GetMobjGround(center) - P_MobjFlip(center);
+
 	S_StartSound(master, sfx_s3k92); // scary ghost noise
 }