diff --git a/Xi/xiproperty.c b/Xi/xiproperty.c
index 14f1491b6..f72603028 100644
--- a/Xi/xiproperty.c
+++ b/Xi/xiproperty.c
@@ -386,7 +386,7 @@ change_property(ClientPtr client, DeviceIntPtr dev, Atom property, Atom type,
  * If name is NULL, None is returned.
  */
 Atom
-XIGetKnownProperty(char *name)
+XIGetKnownProperty(const char *name)
 {
     int i;
 
diff --git a/include/exevents.h b/include/exevents.h
index 720fb2e5a..12ea37885 100644
--- a/include/exevents.h
+++ b/include/exevents.h
@@ -126,7 +126,7 @@ extern _X_EXPORT void XIUnregisterPropertyHandler(
 );
 
 extern _X_EXPORT Atom XIGetKnownProperty(
-        char*                 name
+        const char*           name
 );
 
 extern _X_EXPORT DeviceIntPtr XIGetDevice(xEvent *ev);