diff --git a/source/texk/web2c/ptexdir/tests/fn.tex b/source/texk/web2c/ptexdir/tests/fn.tex
index 973650ab4..c51c8b7b0 100644
--- a/source/texk/web2c/ptexdir/tests/fn.tex
+++ b/source/texk/web2c/ptexdir/tests/fn.tex
@@ -15,5 +15,6 @@
 
 \input "|cat fn-tmp.tex"
 \input fn-tmp.tex
+\input fnさざ波.tex
 
 \relax\end
diff --git "a/source/texk/web2c/ptexdir/tests/fn\343\201\225\343\201\226\346\263\242.tex" "b/source/texk/web2c/ptexdir/tests/fn\343\201\225\343\201\226\346\263\242.tex"
index 9850ed57f..9bb332ed3 100644
--- "a/source/texk/web2c/ptexdir/tests/fn\343\201\225\343\201\226\346\263\242.tex"
+++ "b/source/texk/web2c/ptexdir/tests/fn\343\201\225\343\201\226\346\263\242.tex"
@@ -15,5 +15,6 @@
 
 \input "|cat fnさざ波-tmp.tex"
 \input fnさざ波-tmp.tex
+\input fnさざ波-utf8.tex
 
 \relax\end