diff --git a/zsnes/src/gui/guikeys.inc b/zsnes/src/gui/guikeys.inc
index 5a716b7a..c444d052 100644
--- a/zsnes/src/gui/guikeys.inc
+++ b/zsnes/src/gui/guikeys.inc
@@ -833,6 +833,7 @@ GUIOptionKeys:
 .noautoincsave
     cmp dh,'M'
     jne .nommxcopy
+    xor byte[MMXSupport],1
     call MMXCheck
 .nommxcopy
     cmp dh,'U'
diff --git a/zsnes/src/gui/guimouse.inc b/zsnes/src/gui/guimouse.inc
index 5463fd8e..173147cf 100644
--- a/zsnes/src/gui/guimouse.inc
+++ b/zsnes/src/gui/guimouse.inc
@@ -1363,7 +1363,7 @@ GUIWinClicked:
 %%noclick
 %endmacro
 
-%macro GUIClickCButton5MMX 4
+%macro GUIClickCButton5MMXC 4
     cmp eax,%1+1
     jl %%noclick
     cmp edx,%2+3
@@ -2364,12 +2364,12 @@ DisplayGUISoundClick:
     GUIClickCButton5 11,163,byte[SoundInterpType],1
     GUIClickCButton5 11,173,byte[SoundInterpType],2
 %ifndef __MSDOS__
-    GUIClickCButton5MMX 11,183,byte[SoundInterpType],3
+    GUIClickCButton5MMXC 11,183,byte[SoundInterpType],3
 %endif
     GUIClickCButton5 111,163,byte[LowPassFilterType],1
     GUIClickCButton5 111,173,byte[LowPassFilterType],2
 %ifndef __MSDOS__
-    GUIClickCButton5MMX 111,183,byte[LowPassFilterType],3
+    GUIClickCButton5MMXC 111,183,byte[LowPassFilterType],3
 %endif
     cmp eax,15
     jl near .nosrate