diff --git a/doc/lua/test_single.sh b/doc/lua/test_single.sh
index aa0261e4e0..67de6ab5be 100755
--- a/doc/lua/test_single.sh
+++ b/doc/lua/test_single.sh
@@ -13,6 +13,7 @@ if $LEANLUA $f.lua > $f.produced.out; then
     echo "-- worked"
     exit 0
 else
-    echo "ERROR executing $f.lua, produced output is at $f.produced.out"
+    echo "ERROR executing $f.lua, produced output:"
+    cat  $f.produced.out
     exit 1
 fi
diff --git a/tests/lean/test_single.sh b/tests/lean/test_single.sh
index 21b0fb4a5e..a2fea543f8 100755
--- a/tests/lean/test_single.sh
+++ b/tests/lean/test_single.sh
@@ -24,6 +24,8 @@ if test -f $f.expected.out; then
             if diff $f.produced.out $f.expected.out; then
                 echo "-- mismath was fixed"
             fi
+        else
+            diff $f.produced.out $f.expected.out
         fi
         exit 1
     fi
diff --git a/tests/lua/test_single.sh b/tests/lua/test_single.sh
index fe46e3ae7d..ba05e3e031 100755
--- a/tests/lua/test_single.sh
+++ b/tests/lua/test_single.sh
@@ -11,6 +11,7 @@ if $LEANLUA util.lua $f > $f.produced.out; then
     echo "-- worked"
     exit 0
 else
-    echo "ERROR executing $f, produced output is at $f.produced.out"
+    echo "ERROR executing $f, produced output:"
+    cat $f.produced.out
     exit 1
 fi