diff --git a/src/render.c b/src/render.c
index 9e98a59..80133b4 100644
--- a/src/render.c
+++ b/src/render.c
@@ -744,6 +744,7 @@ void renderer_read_pixels(struct renderer* self, void* dst, uint32_t y,
 	glGetIntegerv(GL_IMPLEMENTATION_COLOR_READ_FORMAT, &read_format);
 	glGetIntegerv(GL_IMPLEMENTATION_COLOR_READ_TYPE, &read_type);
 
+	glFinish();
 	glReadPixels(0, y, width, height, read_format, read_type, dst);
 }