diff --git a/src/common/ConfigManager.cpp b/src/common/ConfigManager.cpp
index 5e25ebe2..c03aca62 100644
--- a/src/common/ConfigManager.cpp
+++ b/src/common/ConfigManager.cpp
@@ -166,7 +166,7 @@ int captureFormat = 0;
 int cheatsEnabled = true;
 int cpuDisableSfx = false;
 int cpuSaveType = 0;
-int disableMMX;
+int enableMMX = 1;
 int disableStatusMessages = 0;
 int dsoundDisableHardwareAcceleration;
 int filterHeight;
@@ -307,7 +307,7 @@ struct option argOptions[] = {
 	{ "cpu-disable-sfx", no_argument, &cpuDisableSfx, 1 },
 	{ "cpu-save-type", required_argument, 0, OPT_CPU_SAVE_TYPE },
 	{ "debug", no_argument, 0, 'd' },
-	{ "disable-mmx", no_argument, &disableMMX, 1 },
+	{ "enable-mmx", no_argument, &enableMMX, 1 },
 	{ "disable-sfx", no_argument, &cpuDisableSfx, 1 },
 	{ "disable-status-messages", no_argument, &disableStatusMessages, 1 },
 	{ "dotcode-file-name-load", required_argument, 0, OPT_DOTCODE_FILE_NAME_LOAD },
@@ -495,7 +495,7 @@ void LoadConfig()
 	cheatsEnabled = ReadPref("cheatsEnabled", 0);
 	cpuDisableSfx = ReadPref("disableSfx", 0);
 	cpuSaveType = ReadPrefHex("saveType");
-	disableMMX = ReadPref("disableMMX", 0);
+	enableMMX = ReadPref("enableMMX", 1);
 	disableStatusMessages = ReadPrefHex("disableStatus");
 	filterMT = ReadPref("filterEnableMultiThreading", 0);
 	filter = ReadPref("filter", 0);
diff --git a/src/common/ConfigManager.h b/src/common/ConfigManager.h
index 9ddf4bfe..7fdaf0a7 100644
--- a/src/common/ConfigManager.h
+++ b/src/common/ConfigManager.h
@@ -56,7 +56,7 @@ extern int cheatsEnabled;
 extern int cpuDisableSfx;
 extern int cpuSaveType;
 extern int dinputKeyFocus;
-extern int disableMMX;
+extern int enableMMX;
 extern int disableStatusMessages;
 extern int dsoundDisableHardwareAcceleration;
 extern int filterHeight;
diff --git a/src/wx/cmdevents.cpp b/src/wx/cmdevents.cpp
index a9974d2b..71a5f3c0 100644
--- a/src/wx/cmdevents.cpp
+++ b/src/wx/cmdevents.cpp
@@ -2995,7 +2995,7 @@ EVT_HANDLER(ApplyPatches, "Apply IPS/UPS/IPF patches if found")
 EVT_HANDLER(MMX, "Enable MMX")
 {
 #ifdef MMX
-    GetMenuOptionInt("MMX", disableMMX, 1);
+    GetMenuOptionInt("MMX", enableMMX, 1);
     update_opts();
 #endif
 }
diff --git a/src/wx/guiinit.cpp b/src/wx/guiinit.cpp
index b5e426c8..240b223a 100644
--- a/src/wx/guiinit.cpp
+++ b/src/wx/guiinit.cpp
@@ -3067,7 +3067,7 @@ bool MainFrame::BindControls()
         MenuOptionIntMask("JoypadAutoholdR", autohold, KEYM_R);
         MenuOptionIntMask("JoypadAutoholdSelect", autohold, KEYM_SELECT);
         MenuOptionIntMask("JoypadAutoholdStart", autohold, KEYM_START);
-        MenuOptionIntMask("MMX", disableMMX, 1);
+        MenuOptionIntMask("MMX", enableMMX, 1);
         MenuOptionBool("EmulatorSpeedupToggle", turbo);
         MenuOptionIntRadioValue("LinkType0Nothing", gopts.gba_link_type, 0);
         MenuOptionIntRadioValue("LinkType1Cable", gopts.gba_link_type, 1);
diff --git a/src/wx/opts.cpp b/src/wx/opts.cpp
index 300d278e..a4957a54 100644
--- a/src/wx/opts.cpp
+++ b/src/wx/opts.cpp
@@ -264,7 +264,7 @@ opt_desc opts[] = {
     INTOPT("preferences/captureFormat", "", wxTRANSLATE("Screen capture file format"), captureFormat, 0, 1),
     INTOPT("preferences/cheatsEnabled", "", wxTRANSLATE("Enable cheats"), cheatsEnabled, 0, 1),
 #ifdef MMX
-    INTOPT("preferences/disableMMX", "MMX", wxTRANSLATE("Enable MMX"), disableMMX, 0, 1),
+    INTOPT("preferences/enableMMX", "MMX", wxTRANSLATE("Enable MMX"), enableMMX, 0, 1),
 #endif
     INTOPT("preferences/disableStatus", "NoStatusMsg", wxTRANSLATE("Disable on-screen status messages"), disableStatusMessages, 0, 1),
     INTOPT("preferences/emulatorType", "", wxTRANSLATE("Type of system to emulate"), gbEmulatorType, 0, 5),