diff --git a/tests/calc.at b/tests/calc.at
index a75a1bc6..5d270dd8 100644
--- a/tests/calc.at
+++ b/tests/calc.at
@@ -570,7 +570,7 @@ _AT_CHECK_CALC_ERROR([$1], [0], [(- *) + (1 2) = 1], [113],
 calc: error: 2222 != 1])
 
 # Check that yyerrok works properly: second error is not reported,
-# third and fourth are.  Parse status is succesfull.
+# third and fourth are.  Parse status is succesful.
 _AT_CHECK_CALC_ERROR([$1], [0], [(* *) + (*) + (*)], [113],
 [1.2: syntax error, unexpected '*', expecting number or '-' or '(' or '!'
 1.10: syntax error, unexpected '*', expecting number or '-' or '(' or '!'