diff --git a/tests/tests-asn1c-compiler/19-param-OK.asn1 b/tests/tests-asn1c-compiler/19-param-OK.asn1
index 31fa772..32c31a2 100644
--- a/tests/tests-asn1c-compiler/19-param-OK.asn1
+++ b/tests/tests-asn1c-compiler/19-param-OK.asn1
@@ -14,7 +14,7 @@
 	SIGNED { ToBeSigned } ::= SEQUENCE {
 		toBeSigned	ToBeSigned,
 		algorithm	OBJECT IDENTIFIER,
-		signature	BIT STRING SIZE(0..256)
+		signature	BIT STRING (SIZE(0..256))
 	}
 
 	Certificate ::= SIGNED { SEQUENCE {