diff --git a/tests/run.sh b/tests/run.sh
index 24caf274..64f3f941 100755
--- a/tests/run.sh
+++ b/tests/run.sh
@@ -228,7 +228,7 @@ for f in $tests; do
             grep -q -E '[Ee]rror|assertion failed' "$awesome_log"; then
         echo "===> ERROR running $f <==="
         grep --color -o --binary-files=text -E '.*[Ee]rror.*|.*assertion failed.*' "$awesome_log" || true
-        ((errors++))
+        ((++errors))
     fi
 done