diff --git a/lib/bind/cua.bind b/lib/bind/cua.bind
index dbf68eaec4..145120ce1c 100644
--- a/lib/bind/cua.bind
+++ b/lib/bind/cua.bind
@@ -116,7 +116,7 @@
 \bind "S-F7"			"thesaurus-entry"
 
 \bind "M-x"			"command-execute"
-\bind "M-o"			"dialog-show toc"
+\bind "C-M-o"			"dialog-show toc"
 
 \bind "F11"			"ui-toggle fullscreen"
 
diff --git a/lib/bind/emacs.bind b/lib/bind/emacs.bind
index 6b9f4444d8..75c23b3e6f 100644
--- a/lib/bind/emacs.bind
+++ b/lib/bind/emacs.bind
@@ -134,7 +134,7 @@
 #bind "F10"                    "------"
 
 \bind "M-x"			"command-execute"
-\bind "M-o"			"dialog-show toc"
+\bind "C-M-o"			"dialog-show toc"
 
 \bind "M-equal"			"buffer-zoom-in"
 \bind "M-plus"			"buffer-zoom-in"
diff --git a/lib/bind/mac.bind b/lib/bind/mac.bind
index 13d81f8ccc..9249f8d255 100644
--- a/lib/bind/mac.bind
+++ b/lib/bind/mac.bind
@@ -101,7 +101,7 @@
 \bind "S-F7"			"thesaurus-entry"
 
 \bind "M-x"				"command-execute"
-\bind "M-o"				"dialog-show toc"
+\bind "C-M-o"				"dialog-show toc"
 
 \bind "C-plus"			"buffer-zoom-in"
 \bind "C-minus"		"buffer-zoom-out"