diff --git a/config.def.h b/config.def.h
index 34c55beafa..5d7f4909f9 100644
--- a/config.def.h
+++ b/config.def.h
@@ -428,6 +428,8 @@ static const bool aspect_ratio_auto = false;
 
 #if defined(__CELLOS_LV2) || defined(_XBOX360)
 static unsigned aspect_ratio_idx = ASPECT_RATIO_16_9;
+#elif defined(PSP)
+static unsigned aspect_ratio_idx = ASPECT_RATIO_CORE;
 #elif defined(RARCH_CONSOLE)
 static unsigned aspect_ratio_idx = ASPECT_RATIO_4_3;
 #else
diff --git a/gfx/psp/psp1_gfx.c b/gfx/psp/psp1_gfx.c
index c335f34638..47b027dd68 100644
--- a/gfx/psp/psp1_gfx.c
+++ b/gfx/psp/psp1_gfx.c
@@ -716,7 +716,7 @@ static void psp_update_viewport(psp1_video_t* psp)
 #endif
       {
          if ((fabsf(device_aspect - desired_aspect) < 0.0001f)
-               || (fabsf((16.0/9.0) - desired_aspect) < 0.0001f))
+               || (fabsf((16.0/9.0) - desired_aspect) < 0.02f))
          {
             /* If the aspect ratios of screen and desired aspect 
              * ratio are sufficiently equal (floating point stuff),
@@ -751,6 +751,9 @@ static void psp_update_viewport(psp1_video_t* psp)
       psp->vp.height = height;
    }
 
+   psp->vp.width += psp->vp.width&0x1;
+   psp->vp.height += psp->vp.height&0x1;
+
    psp_set_screen_coords(psp->frame_coords, psp->vp.x,
          psp->vp.y, psp->vp.width, psp->vp.height, psp->rotation);