diff --git a/source/src/physics.cpp b/source/src/physics.cpp
index 750b74e2..a28c6ebb 100644
--- a/source/src/physics.cpp
+++ b/source/src/physics.cpp
@@ -184,7 +184,7 @@ bool objcollide(physent *d, const vec &objpos, float objrad, float objheight) //
 // drop & rise are supplied by the physics below to indicate gravity/push for current mini-timestep
 static int cornersurface = 0;
 
-bool collide(physent *d, bool spawn = false, float drop = 0, float rise = 0)
+bool collide(physent *d, bool spawn, float drop, float rise)
 {
     cornersurface = 0;
     const float fx1 = d->o.x-d->radius;     // figure out integer cube rectangle this entity covers in map
diff --git a/source/src/protos.h b/source/src/protos.h
index 5f7677a9..f48801da 100644
--- a/source/src/protos.h
+++ b/source/src/protos.h
@@ -701,6 +701,7 @@ extern void mousemove(int dx, int dy);
 extern void fixcamerarange(physent *cam = camera1);
 extern void updatecrouch(playerent *p, bool on);
 extern bool objcollide(physent *d, const vec &objpos, float objrad, float objheight);
+extern bool collide(physent *d, bool spawn = false, float drop = 0, float rise = 0);
 extern void attack(bool on);
 extern void vecfromyawpitch(float yaw, float pitch, int move, int strafe, vec &m);
 extern void vectoyawpitch(const vec &v, float &yaw, float &pitch);