diff --git a/src/frameworks/Carbon/HIToolbox/include/HIToolbox/TextInputSources.h b/src/frameworks/Carbon/HIToolbox/include/HIToolbox/TextInputSources.h
index 24475147a..8d457c216 100644
--- a/src/frameworks/Carbon/HIToolbox/include/HIToolbox/TextInputSources.h
+++ b/src/frameworks/Carbon/HIToolbox/include/HIToolbox/TextInputSources.h
@@ -6,6 +6,8 @@
 extern "C" {
 #endif
 
+extern const CFStringRef kTISNotifySelectedKeyboardInputSourceChanged;
+
 extern const CFStringRef kTISPropertyInputSourceID;
 extern const CFStringRef kTISPropertyUnicodeKeyLayoutData;
 extern const CFStringRef kTISCategoryKeyboardInputSource;
diff --git a/src/frameworks/Carbon/HIToolbox/src/constants.c b/src/frameworks/Carbon/HIToolbox/src/constants.c
index 7d51bbf81..0e2907f53 100644
--- a/src/frameworks/Carbon/HIToolbox/src/constants.c
+++ b/src/frameworks/Carbon/HIToolbox/src/constants.c
@@ -2,6 +2,8 @@
 #include <HIToolbox/TextInputSources.h>
 
 /* HIToolbox.framework */
+const CFStringRef kTISNotifySelectedKeyboardInputSourceChanged = CFSTR("com.apple.Carbon.TISNotifySelectedKeyboardInputSourceChanged");
+
 const CFStringRef kTISPropertyInputSourceID = CFSTR("TISPropertyInputSourceID");
 const CFStringRef kTISPropertyInputSourceIsFromSystem = CFSTR("TISPropertyInputSourceIsFromSystem");
 const CFStringRef kTISPropertyInputSourceIsASCIICapable = CFSTR("TISPropertyInputSourceIsASCIICapable");