diff --git a/tests/regression.at b/tests/regression.at
index 5895fd06..13d3ab9e 100644
--- a/tests/regression.at
+++ b/tests/regression.at
@@ -298,7 +298,7 @@ input.y:5.1: invalid character: `%'
 input.y:6.1: invalid character: `%'
 input.y:6.2: invalid character: `-'
 input.y:7.1-8.0: unexpected end of file in a prologue
-input.y:7.1-8.0: parse error, unexpected "%{...}%", expecting ";" or "|"
+input.y:7.1-8.0: parse error, unexpected "%{...%}", expecting ";" or "|"
 ]])
 
 AT_CLEANUP