diff --git a/kitty/shaders.c b/kitty/shaders.c
index 35867931e..67f8662a4 100644
--- a/kitty/shaders.c
+++ b/kitty/shaders.c
@@ -330,7 +330,6 @@ draw_cells_interleaved(ssize_t vao_idx, ssize_t gvao_idx, Screen *screen, OSWind
     glBindFramebuffer(GL_DRAW_FRAMEBUFFER, offscreen_framebuffer);
     glFramebufferTexture(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, os_window->offscreen_texture_id, 0);
     /* if (glCheckFramebufferStatus(GL_DRAW_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) fatal("offscreen framebuffer not complete"); */
-    glViewport(0, 0, os_window->viewport_width, os_window->viewport_height);
 
     bind_program(CELL_BG_PROGRAM); 
     glDrawArraysInstanced(GL_TRIANGLE_FAN, 0, 4, screen->lines * screen->columns); 
@@ -349,7 +348,6 @@ draw_cells_interleaved(ssize_t vao_idx, ssize_t gvao_idx, Screen *screen, OSWind
 
     glDisable(GL_BLEND);
     glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
-    glViewport(0, 0, os_window->viewport_width, os_window->viewport_height);
 
     // Now render the framebuffer to the screen reversing alpha pre-multiplication
     glEnable(GL_SCISSOR_TEST);