diff --git a/tests/file-tests/prepare.sh b/tests/file-tests/prepare.sh
index b7bfb6d..fe9a3b5 100755
--- a/tests/file-tests/prepare.sh
+++ b/tests/file-tests/prepare.sh
@@ -15,12 +15,14 @@ printf $'#!/bin/bash
 compare() {
     IN="db/$1"
     OUT="$TMPDIR/out"
-    rlRun "file \'$IN\' > \'$OUT\'" "0" "Run file on $1"
+    ERR="$TMPDIR/err"
+    rlRun "file \'$IN\' > \'$OUT\' 2> \'$ERR\'" "0" "Run file on $1"
     sed -i "s|^$IN: ||" "$OUT"
     REF="reference/$1.ref"
     if ! rlAssertNotDiffer "$REF" "$OUT"; then
         rlRun -l "diff -u \'$REF\' \'$OUT\'" 1
     fi
+    rlRun "test ! -s \'$ERR\'" "0" "Check that stderr was empty"
 }
 
 PACKAGE="file"
diff --git a/tests/file-tests/runtest.sh b/tests/file-tests/runtest.sh
index 9a4a97c..9b280fc 100755
--- a/tests/file-tests/runtest.sh
+++ b/tests/file-tests/runtest.sh
@@ -4,12 +4,14 @@
 compare() {
     IN="db/$1"
     OUT="$TMPDIR/out"
-    rlRun "file '$IN' > '$OUT'" "0" "Run file on $1"
+    ERR="$TMPDIR/err"
+    rlRun "file '$IN' > '$OUT' 2> '$ERR'" "0" "Run file on $1"
     sed -i "s|^$IN: ||" "$OUT"
     REF="reference/$1.ref"
     if ! rlAssertNotDiffer "$REF" "$OUT"; then
         rlRun -l "diff -u '$REF' '$OUT'" 1
     fi
+    rlRun "test ! -s '$ERR'" "0" "Check that stderr was empty"
 }
 
 PACKAGE="file"