diff --git a/grid.c b/grid.c
index e7f9ab7c6..830929c0e 100644
--- a/grid.c
+++ b/grid.c
@@ -18,9 +18,6 @@
 
 #include <sys/types.h>
 
-#ifdef __APPLE__
-#include <assert.h>
-#endif
 #include <stdlib.h>
 #include <string.h>
 
@@ -59,42 +56,6 @@ static const struct grid_cell_entry grid_cleared_entry = {
 	{ .data = { 0, 8, 8, ' ' } }, GRID_FLAG_CLEARED
 };
 
-#ifdef __APPLE__
-void
-grid_check_is_clear(struct grid *gd)
-{
-	struct grid_line	*gl;
-	u_int			 yy, ny;
-
-	assert(gd != NULL);
-
-	if (gd->sy == 0) {
-		assert(gd->linedata == NULL);
-		return;
-	}
-
-	assert(gd->linedata != NULL);
-
-	ny = gd->hsize + gd->sy;
-	for (yy = 0; yy < ny; yy++) {
-		gl = &gd->linedata[yy];
-
-		assert(gl->celldata == NULL);
-		assert(gl->cellused == 0);
-		assert(gl->cellsize == 0);
-		assert(gl->extddata == NULL);
-		assert(gl->extdsize == 0);
-		assert(gl->flags == 0);
-		assert(gl->time == 0);
-	}
-}
-#else
-void
-grid_check_is_clear(__unused struct grid *gd)
-{
-}
-#endif
-
 /* Store cell in entry. */
 static void
 grid_store_cell(struct grid_cell_entry *gce, const struct grid_cell *gc,
@@ -347,12 +308,6 @@ grid_free_line(struct grid *gd, u_int py)
 {
 	struct grid_line	*gl = &gd->linedata[py];
 
-#ifdef __APPLE__
-	assert(gl->cellused <= gl->cellsize);
-	assert(gl->extdsize == 0 || gl->extddata != NULL);
-	assert(gl->cellsize == 0 || gl->celldata != NULL);
-#endif
-
 	free(gl->celldata);
 	free(gl->extddata);
 	memset(gl, 0, sizeof *gl);
@@ -384,11 +339,6 @@ grid_create(u_int sx, u_int sy, u_int hlimit)
 
 	if (gd->sy != 0)
 		gd->linedata = xcalloc(gd->sy, sizeof *gd->linedata);
-
-#ifdef __APPLE__
-	assert(gd->hsize == 0);
-#endif
-	grid_check_is_clear(gd);
 	return (gd);
 }
 
diff --git a/screen.c b/screen.c
index 2a088edff..e8d90d595 100644
--- a/screen.c
+++ b/screen.c
@@ -101,12 +101,12 @@ screen_init(struct screen *s, u_int sx, u_int sy, u_int hlimit)
 	s->write_list = NULL;
 	s->hyperlinks = NULL;
 
-	screen_reinit(s, 1);
+	screen_reinit(s);
 }
 
 /* Reinitialise screen. */
 void
-screen_reinit(struct screen *s, int check)
+screen_reinit(struct screen *s)
 {
 	s->cx = 0;
 	s->cy = 0;
@@ -125,8 +125,6 @@ screen_reinit(struct screen *s, int check)
 	s->saved_cy = UINT_MAX;
 
 	screen_reset_tabs(s);
-	if (check)
-		grid_check_is_clear(s->grid);
 	grid_clear_lines(s->grid, s->grid->hsize, s->grid->sy, 8);
 
 	screen_clear_selection(s);
diff --git a/spawn.c b/spawn.c
index 63300e4fb..4717b55c1 100644
--- a/spawn.c
+++ b/spawn.c
@@ -327,7 +327,7 @@ spawn_pane(struct spawn_context *sc, char **cause)
 			sc->wp0->fd = -1;
 		}
 		window_pane_reset_mode_all(sc->wp0);
-		screen_reinit(&sc->wp0->base, 0);
+		screen_reinit(&sc->wp0->base);
 		if (sc->wp0->ictx != NULL) {
 			input_free(sc->wp0->ictx);
 			sc->wp0->ictx = NULL;
diff --git a/tmux.h b/tmux.h
index 1fe443561..37a504ac8 100644
--- a/tmux.h
+++ b/tmux.h
@@ -3674,7 +3674,7 @@ int	 redraw_get_status_border_cell_type(struct redraw_span **, u_int);
 
 /* screen.c */
 void	 screen_init(struct screen *, u_int, u_int, u_int);
-void	 screen_reinit(struct screen *, int);
+void	 screen_reinit(struct screen *);
 void	 screen_free(struct screen *);
 void	 screen_reset_tabs(struct screen *);
 void	 screen_reset_hyperlinks(struct screen *);