diff --git a/Xi/xiproperty.c b/Xi/xiproperty.c
index b0574282d1..e79a2edc65 100644
--- a/Xi/xiproperty.c
+++ b/Xi/xiproperty.c
@@ -121,7 +121,7 @@ XIRegisterPropertyHandler(DeviceIntPtr         dev,
 }
 
 void
-XIUnRegisterPropertyHandler(DeviceIntPtr dev, long id)
+XIUnregisterPropertyHandler(DeviceIntPtr dev, long id)
 {
     XIPropertyHandlerPtr curr, prev = NULL;
 
diff --git a/include/exevents.h b/include/exevents.h
index be6521049d..2a7ec97a24 100644
--- a/include/exevents.h
+++ b/include/exevents.h
@@ -240,7 +240,7 @@ extern _X_EXPORT long XIRegisterPropertyHandler(
                                Atom property)
 );
 
-extern _X_EXPORT void XIUnRegisterPropertyHandler(
+extern _X_EXPORT void XIUnregisterPropertyHandler(
         DeviceIntPtr          dev,
         long                  id
 );