diff --git a/src/fallback.cpp b/src/fallback.cpp
index 8746e1243..a776e3345 100644
--- a/src/fallback.cpp
+++ b/src/fallback.cpp
@@ -194,6 +194,7 @@ int fish_wcwidth(wchar_t wc) {
     int width = widechar_wcwidth(wc);
 
     switch (width) {
+        case widechar_non_character:
         case widechar_nonprint:
         case widechar_combining:
         case widechar_unassigned: