diff --git a/src/engine/bih.cc b/src/engine/bih.cc
index 3d3f453..12e77db 100644
--- a/src/engine/bih.cc
+++ b/src/engine/bih.cc
@@ -1,3 +1,4 @@
+#include "physics.hh"
 #include "rendermodel.hh" // loadmapmodel
 #include "stain.hh"
 #include "texture.hh"
diff --git a/src/engine/dynlight.cc b/src/engine/dynlight.cc
index d331652..22b20d0 100644
--- a/src/engine/dynlight.cc
+++ b/src/engine/dynlight.cc
@@ -1,5 +1,6 @@
 #include "dynlight.hh"
 
+#include "physics.hh" // collide
 #include "pvs.hh"
 #include "rendergl.hh" // camera1
 #include "renderva.hh"
diff --git a/src/engine/octaedit.cc b/src/engine/octaedit.cc
index db99a41..1a8397c 100644
--- a/src/engine/octaedit.cc
+++ b/src/engine/octaedit.cc
@@ -7,6 +7,7 @@
 #include "material.hh"
 #include "octa.hh"
 #include "octarender.hh"
+#include "physics.hh"
 #include "pvs.hh"
 #include "rendergl.hh"
 #include "renderlights.hh"
diff --git a/src/engine/physics.hh b/src/engine/physics.hh
index 37b0caf..e6665ca 100644
--- a/src/engine/physics.hh
+++ b/src/engine/physics.hh
@@ -3,10 +3,36 @@
 
 #include <shared/geom.hh>
 
+struct dynent;
+struct physent;
 struct extentity;
+struct entity;
+
+extern vec collidewall;
+extern int collideinside;
+extern physent *collideplayer;
 
 bool overlapsdynent(const vec &o, float radius);
 void rotatebb(vec &center, vec &radius, int yaw, int pitch, int roll = 0);
 float shadowray(const vec &o, const vec &ray, float radius, int mode, extentity *t = NULL);
 
+void moveplayer(physent *pl, int moveres, bool local);
+bool moveplayer(physent *pl, int moveres, bool local, int curtime);
+void crouchplayer(physent *pl, int moveres, bool local);
+bool collide(physent *d, const vec &dir = vec(0, 0, 0), float cutoff = 0.0f, bool playercol = true, bool insideplayercol = false);
+bool bounce(physent *d, float secs, float elasticity, float waterfric, float grav);
+bool bounce(physent *d, float elasticity, float waterfric, float grav);
+void avoidcollision(physent *d, const vec &dir, physent *obstacle, float space);
+bool movecamera(physent *pl, const vec &dir, float dist, float stepdist);
+void physicsframe();
+void dropenttofloor(entity *e);
+bool droptofloor(vec &o, float radius, float height);
+
+void vecfromyawpitch(float yaw, float pitch, int move, int strafe, vec &m);
+void vectoyawpitch(const vec &v, float &yaw, float &pitch);
+void updatephysstate(physent *d);
+void cleardynentcache();
+void updatedynentcache(physent *d);
+bool entinmap(dynent *d, bool avoidplayers = false);
+
 #endif
diff --git a/src/engine/rendergl.cc b/src/engine/rendergl.cc
index 6736de4..44c53b0 100644
--- a/src/engine/rendergl.cc
+++ b/src/engine/rendergl.cc
@@ -9,6 +9,7 @@
 #include "pvs.hh"
 #include "octaedit.hh"
 #include "octarender.hh" // valist
+#include "physics.hh" // movecamera
 #include "rendergl.hh"
 #include "renderlights.hh"
 #include "rendermodel.hh"
diff --git a/src/engine/rendermodel.cc b/src/engine/rendermodel.cc
index 8e77900..854c804 100644
--- a/src/engine/rendermodel.cc
+++ b/src/engine/rendermodel.cc
@@ -5,6 +5,7 @@
 #include "console.hh" /* conoutf */
 #include "main.hh" // loadprogress, renderprogress
 #include "octarender.hh"
+#include "physics.hh" // collidewall
 #include "pvs.hh"
 #include "rendergl.hh"
 #include "renderva.hh"
diff --git a/src/game/game.cc b/src/game/game.cc
index 54975a1..b350036 100644
--- a/src/game/game.cc
+++ b/src/game/game.cc
@@ -1,6 +1,7 @@
 #include "cube.hh"
 
 #include <engine/octaedit.hh>
+#include <engine/physics.hh>
 #include <engine/worldio.hh>
 #include <engine/world.hh>
 
diff --git a/src/shared/iengine.hh b/src/shared/iengine.hh
index 90f8840..55c819f 100644
--- a/src/shared/iengine.hh
+++ b/src/shared/iengine.hh
@@ -84,29 +84,3 @@ extern void loopend(ident *id, identstack &stack);
 #define loopstart(id, stack) if((id)->type != ID_ALIAS) return; identstack stack;
 static inline void loopiter(ident *id, identstack &stack, int i) { tagval v; v.setint(i); loopiter(id, stack, v); }
 static inline void loopiter(ident *id, identstack &stack, float f) { tagval v; v.setfloat(f); loopiter(id, stack, v); }
-
-// physics
-extern vec collidewall;
-extern int collideinside;
-extern physent *collideplayer;
-
-extern void moveplayer(physent *pl, int moveres, bool local);
-extern bool moveplayer(physent *pl, int moveres, bool local, int curtime);
-extern void crouchplayer(physent *pl, int moveres, bool local);
-extern bool collide(physent *d, const vec &dir = vec(0, 0, 0), float cutoff = 0.0f, bool playercol = true, bool insideplayercol = false);
-extern bool bounce(physent *d, float secs, float elasticity, float waterfric, float grav);
-extern bool bounce(physent *d, float elasticity, float waterfric, float grav);
-extern void avoidcollision(physent *d, const vec &dir, physent *obstacle, float space);
-extern bool overlapsdynent(const vec &o, float radius);
-extern bool movecamera(physent *pl, const vec &dir, float dist, float stepdist);
-extern void physicsframe();
-extern void dropenttofloor(entity *e);
-extern bool droptofloor(vec &o, float radius, float height);
-
-extern void vecfromyawpitch(float yaw, float pitch, int move, int strafe, vec &m);
-extern void vectoyawpitch(const vec &v, float &yaw, float &pitch);
-extern void updatephysstate(physent *d);
-extern void cleardynentcache();
-extern void updatedynentcache(physent *d);
-extern bool entinmap(dynent *d, bool avoidplayers = false);
-extern void findplayerspawn(dynent *d, int forceent = -1, int tag = 0);
diff --git a/src/shared/igame.hh b/src/shared/igame.hh
index ff50705..037986a 100644
--- a/src/shared/igame.hh
+++ b/src/shared/igame.hh
@@ -54,7 +54,6 @@ namespace game
     extern void updateworld();
     extern void initclient();
     extern void physicstrigger(physent *d, bool local, int floorlevel, int waterlevel, int material = 0);
-    extern void bounced(physent *d, const vec &surface);
     extern void edittrigger(const selinfo &sel, int op, int arg1 = 0, int arg2 = 0, int arg3 = 0, const VSlot *vs = NULL);
     extern void vartrigger(ident *id);
     extern void dynentcollide(physent *d, physent *o, const vec &dir);