diff --git a/src/opengl.c b/src/opengl.c
index 63b9ab6..66019e6 100644
--- a/src/opengl.c
+++ b/src/opengl.c
@@ -245,7 +245,7 @@ void gl_blitSprite(const gl_texture* sprite, const Vec2* pos, const int sx, cons
 
   glMatrixMode(GL_PROJECTION);
   glPushMatrix(); // Projection translation matrix.
-  glTranslated(VX(*pos) -VX(*gl_camera) - sprite->sw/2.,
+  glTranslated(VX(*pos) - VX(*gl_camera) - sprite->sw/2.,
         VY(*pos) -VY(*gl_camera) - sprite->sh/2., 0.);
   glScalef((double)gl_screen.w/SCREEN_W, (double)gl_screen.h/SCREEN_H, 0.);
 
diff --git a/src/physics.c b/src/physics.c
index 2318a2b..12d587e 100644
--- a/src/physics.c
+++ b/src/physics.c
@@ -121,7 +121,7 @@ static void rk4_update(Solid* obj, const double dt) {
   // Make sure angle doesn't flip.
   obj->dir += M_PI/360.*obj->dir_vel*dt;
   if(obj->dir > 2*M_PI)   obj->dir -= 2*M_PI;
-  if(obj->dir < 0.0)      obj->dir += 2*M_PI;
+  if(obj->dir < 0.)      obj->dir += 2*M_PI;
 
   int N = (dt > RK4_MIN_H) ? (int)(dt/RK4_MIN_H) : 1;
   double h = dt / (double)N; // Step.
@@ -154,7 +154,7 @@ static void rk4_update(Solid* obj, const double dt) {
       ty = iy = vy;
       ty += 2.*(iy + h/2.*ty);
       ty += 2.*(iy + h/2.*ty);
-      ty += iy +h*ty;
+      ty += iy + h*ty;
       ty *= h/6.;
 
       py += ty;