diff --git a/src/deh_tables.c b/src/deh_tables.c
index ea5991732..bacb32563 100644
--- a/src/deh_tables.c
+++ b/src/deh_tables.c
@@ -5685,7 +5685,7 @@ const char *const MOBJFLAG_LIST[] = {
 	"BOSS",
 	"SPAWNCEILING",
 	"NOGRAVITY",
-	"AMBIENT",
+	"\x01",	// free: 1<<10 (name un-matchable)
 	"SLIDEME",
 	"NOCLIP",
 	"FLOAT",
diff --git a/src/info.c b/src/info.c
index cbde12f82..8cfb54d28 100644
--- a/src/info.c
+++ b/src/info.c
@@ -19016,7 +19016,7 @@ mobjinfo_t mobjinfo[NUMMOBJTYPES] =
 		100,            // mass
 		0,              // damage
 		sfx_None,       // activesound
-		MF_NOBLOCKMAP|MF_NOSECTOR|MF_NOGRAVITY|MF_AMBIENT, // flags
+		MF_NOBLOCKMAP|MF_NOSECTOR|MF_NOGRAVITY, // flags
 		S_NULL          // raisestate
 	},
 
@@ -28256,7 +28256,7 @@ mobjinfo_t mobjinfo[NUMMOBJTYPES] =
 	    0,              // mass
 	    0,              // damage
 	    sfx_None,       // activesound
-	    MF_NOBLOCKMAP|MF_NOSECTOR|MF_NOGRAVITY|MF_AMBIENT, // flags
+	    MF_NOBLOCKMAP|MF_NOSECTOR|MF_NOGRAVITY, // flags
 	    S_NULL          // raisestate
 	},
 
@@ -28283,7 +28283,7 @@ mobjinfo_t mobjinfo[NUMMOBJTYPES] =
 	    0,              // mass
 	    0,              // damage
 	    sfx_None,       // activesound
-	    MF_NOBLOCKMAP|MF_NOSECTOR|MF_NOGRAVITY|MF_AMBIENT, // flags
+	    MF_NOBLOCKMAP|MF_NOSECTOR|MF_NOGRAVITY, // flags
 	    S_NULL          // raisestate
 	},
 
diff --git a/src/p_mobj.h b/src/p_mobj.h
index 429f48812..aee8cda1a 100644
--- a/src/p_mobj.h
+++ b/src/p_mobj.h
@@ -122,8 +122,8 @@ typedef enum
 	// Don't apply gravity (every tic); object will float, keeping current height
 	//  or changing it actively.
 	MF_NOGRAVITY        = 1<<9,
-	// This object is an ambient sound. Obsolete, but keep this around for backwards compatibility.
-	MF_AMBIENT          = 1<<10,
+	// Free:
+	// 1<<10
 	// Slide this object when it hits a wall.
 	MF_SLIDEME          = 1<<11,
 	// Don't collide with walls or solid objects. Two MF_NOCLIP objects can't touch each other at all!