diff --git a/engine/server/progdefs.h b/engine/server/progdefs.h
index 83e093a3a..323777332 100644
--- a/engine/server/progdefs.h
+++ b/engine/server/progdefs.h
@@ -90,7 +90,7 @@ typedef struct entvars_s
 	vec3_t	absmin;
 	vec3_t	absmax;
 	float	ltime;
-	float	lastruntime;
+	int		lastruntime;
 	float	movetype;
 	float	solid;
 	vec3_t	origin;
diff --git a/engine/server/server.h b/engine/server/server.h
index 850daffe4..c6edcaf56 100644
--- a/engine/server/server.h
+++ b/engine/server/server.h
@@ -696,6 +696,7 @@ typedef struct
 	gametype_e	gametype;
 	int			spawncount;			// number of servers spawned since start,
 									// used to check late spawns
+	int framenum;	//physics frame number for out-of-sequence thinks (fix for slow rockets)
 
 	int socketip;
 	int socketip6;
diff --git a/engine/server/sv_main.c b/engine/server/sv_main.c
index c2725b9ae..a961bf9e1 100644
--- a/engine/server/sv_main.c
+++ b/engine/server/sv_main.c
@@ -2805,6 +2805,7 @@ void SV_Frame (void)
 	start = Sys_DoubleTime ();
 	svs.stats.idle += start - end;
 	end = start;
+	svs.framenum++;
 
 // keep the random time dependent
 	rand ();
diff --git a/engine/server/sv_phys.c b/engine/server/sv_phys.c
index 01db6d44b..9b37b1621 100644
--- a/engine/server/sv_phys.c
+++ b/engine/server/sv_phys.c
@@ -1730,9 +1730,9 @@ void SV_RunEntity (edict_t *ent)
 	}
 	else
 	{
-		if (ent->v->lastruntime == (float)realtime)
+		if (ent->v->lastruntime == svs.framenum)
 			return;
-		ent->v->lastruntime = (float)realtime;
+		ent->v->lastruntime = svs.framenum;
 	}