diff --git a/nq/include/server.h b/nq/include/server.h
index 085c7f463..5e283a23b 100644
--- a/nq/include/server.h
+++ b/nq/include/server.h
@@ -212,6 +212,7 @@ extern	struct cvar_s	*timelimit;
 
 extern	struct cvar_s	*sv_maxvelocity;
 extern	struct cvar_s	*sv_gravity;
+extern	struct cvar_s	*sv_jump_any;
 extern	struct cvar_s	*sv_nostep;
 extern	struct cvar_s	*sv_friction;
 extern	struct cvar_s	*sv_edgefriction;
@@ -264,6 +265,7 @@ void SV_ClientPrintf (const char *fmt, ...) __attribute__((format(printf,1,2)));
 void SV_BroadcastPrintf (const char *fmt, ...) __attribute__((format(printf,1,2)));
 
 struct trace_s SV_PushEntity (edict_t *ent, vec3_t push);
+int SV_EntCanSupportJump (edict_t *ent);
 int SV_FlyMove (edict_t *ent, float time, struct trace_s *steptrace);
 void SV_CheckVelocity (edict_t *ent);
 qboolean SV_RunThink (edict_t *ent);
diff --git a/nq/source/sv_cl_phys.c b/nq/source/sv_cl_phys.c
index d07cd3753..c30d35cc6 100644
--- a/nq/source/sv_cl_phys.c
+++ b/nq/source/sv_cl_phys.c
@@ -291,7 +291,7 @@ SV_WalkMove (edict_t *ent)
 	downtrace = SV_PushEntity (ent, downmove);	// FIXME: don't link?
 
 	if (downtrace.plane.normal[2] > 0.7) {
-		if (SVfloat (ent, solid) == SOLID_BSP) {
+		if (SV_EntCanSupportJump (ent)) {
 			SVfloat (ent, flags) = (int) SVfloat (ent, flags) | FL_ONGROUND;
 			SVfloat (ent, groundentity) = EDICT_TO_PROG (&sv_pr_state,
 														 downtrace.ent);
diff --git a/nq/source/sv_main.c b/nq/source/sv_main.c
index f870c9fff..e6f230e39 100644
--- a/nq/source/sv_main.c
+++ b/nq/source/sv_main.c
@@ -87,6 +87,7 @@ SV_Init (void)
 							   "None");
 	sv_gravity = Cvar_Get ("sv_gravity", "800", CVAR_SERVERINFO, Cvar_Info,
 						   "None");
+	sv_jump_any = Cvar_Get ("sv_jump_any", "1", CVAR_NONE, NULL, "None");
 	sv_friction = Cvar_Get ("sv_friction", "4", CVAR_SERVERINFO, Cvar_Info,
 							"None");
 	sv_edgefriction = Cvar_Get ("edgefriction", "2", CVAR_NONE, NULL, "None");
diff --git a/nq/source/sv_phys.c b/nq/source/sv_phys.c
index 7c195c264..e65c8bc76 100644
--- a/nq/source/sv_phys.c
+++ b/nq/source/sv_phys.c
@@ -61,6 +61,7 @@ static __attribute__ ((used)) const char rcsid[] =
 
 cvar_t     *sv_friction;
 cvar_t     *sv_gravity;
+cvar_t     *sv_jump_any;
 cvar_t     *sv_stopspeed;
 cvar_t     *sv_maxvelocity;
 cvar_t     *sv_nostep;
@@ -224,6 +225,19 @@ ClipVelocity (vec3_t in, vec3_t normal, vec3_t out, float overbounce)
 	return blocked;
 }
 
+int
+SV_EntCanSupportJump (edict_t *ent)
+{
+	int         solid = SVfloat (ent, solid);
+	if (solid == SOLID_BSP)
+		return 1;
+	if (!sv_jump_any->int_val)
+		return 0;
+	if (solid == SOLID_NOT || solid == SOLID_SLIDEBOX)
+		return 0;
+	return 1;
+}
+
 #define	MAX_CLIP_PLANES	5
 
 /*
@@ -284,7 +298,7 @@ SV_FlyMove (edict_t *ent, float time, trace_t *steptrace)
 
 		if (trace.plane.normal[2] > 0.7) {
 			blocked |= 1;				// floor
-			if (SVfloat (trace.ent, solid) == SOLID_BSP) {
+			if (SV_EntCanSupportJump (trace.ent)) {
 				SVfloat (ent, flags) = (int) SVfloat (ent, flags) |
 					FL_ONGROUND;
 				SVentity (ent, groundentity) = EDICT_TO_PROG (&sv_pr_state,