diff --git a/gfx/gl.c b/gfx/gl.c
index bccfd63..1a30613 100644
--- a/gfx/gl.c
+++ b/gfx/gl.c
@@ -997,13 +997,16 @@ static inline void gl_copy_frame(gl_t *gl, const void *frame, unsigned width, un
       }
       else // Slower path.
       {
+         uint8_t *fbuf = malloc(width * height * 2); // Allocate buffer once and reuse it
          const uint8_t *src = (const uint8_t*)frame;
          for (unsigned h = 0; h < height; h++, src += pitch)
-         {
-            glTexSubImage2D(GL_TEXTURE_2D,
-                  0, 0, h, width, 1, gl->texture_type,
-                  gl->texture_fmt, src);
-         }
+            memcpy(&fbuf[h * (width * 2)], src, width * 2);
+
+         glTexSubImage2D(GL_TEXTURE_2D,
+                  0, 0, 0, width, height, gl->texture_type,
+                  gl->texture_fmt, fbuf);
+
+         free(fbuf);
       }
    }
 #else