error in passed calculation

diff --git a/tests/TESTrun.sh b/tests/TESTrun.sh
index 1f5fee0b77c65fe29d71a7ed287ce9018b70d0b2..dfcc330742633867b437b36f70a86f51c608c127 100755 (executable)
--- a/tests/TESTrun.sh
+++ b/tests/TESTrun.sh
@@ -36,7 +36,7 @@ do
   then
       echo $name: passed.
       rm -f DIFF/$output.diff
-      passed=`expr passed + 1`
+      passed=`expr $passed + 1`
       echo $passed >.passed
   else
       echo $name: failed.