diff --git a/intern/ghost/intern/GHOST_SystemX11.cc b/intern/ghost/intern/GHOST_SystemX11.cc
index de81a9ddf8f..567fe3b228e 100644
--- a/intern/ghost/intern/GHOST_SystemX11.cc
+++ b/intern/ghost/intern/GHOST_SystemX11.cc
@@ -1108,10 +1108,9 @@ void GHOST_SystemX11::processEvent(XEvent *xe)
           }
 
           if (ELEM(status, XLookupChars, XLookupBoth)) {
-            if (uchar(utf8_buf[0]) >= 32) { /* not an ascii control character */
-              /* do nothing for now, this is valid utf8 */
-            }
-            else {
+            /* Check for ASCII control characters.
+             * Inline `iscntrl` because the users locale must not change behavior. */
+            if ((utf8_buf[0] < 32 && utf8_buf[0] > 0) || (utf8_buf[0] == 127)) {
               utf8_buf[0] = '\0';
             }
           }
diff --git a/source/blender/windowmanager/intern/wm_event_system.cc b/source/blender/windowmanager/intern/wm_event_system.cc
index 4c17e4590c4..4ecb715a260 100644
--- a/source/blender/windowmanager/intern/wm_event_system.cc
+++ b/source/blender/windowmanager/intern/wm_event_system.cc
@@ -5670,7 +5670,9 @@ void wm_event_add_ghostevent(wmWindowManager *wm, wmWindow *win, const int type,
         event.utf8_buf[0] = '\0';
       }
       else {
-        if (event.utf8_buf[0] < 32 && event.utf8_buf[0] > 0) {
+        /* Check for ASCII control characters.
+         * Inline `iscntrl` because the users locale must not change behavior. */
+        if ((event.utf8_buf[0] < 32 && event.utf8_buf[0] > 0) || (event.utf8_buf[0] == 127)) {
           event.utf8_buf[0] = '\0';
         }
       }