diff --git a/processor/struct.m4 b/processor/struct.m4
index f606134..be41a15 100644
--- a/processor/struct.m4
+++ b/processor/struct.m4
@@ -32,7 +32,7 @@ DECL_STRUCT_P_FUNC(`$1', `$2', 1)
 		IFASSERT(`
 			/* {{{ init assert */
 			ifdef(`SIZEOF_$1', , `m4_errprint(`missing SIZEOF_$1, safe to ignore')')
-			ifdef(`COUNTOF_$1', , `m4_errprint(`missing COUNTOF_$1, safe to ignore'))')
+			ifdef(`COUNTOF_$1', , `m4_errprint(`missing COUNTOF_$1, safe to ignore')')
 			dnl SIZEOF_x COUNTOF_x can be both defined or both not
 			ifdef(`SIZEOF_$1', `
 				ifdef(`COUNTOF_$1', , `m4_errprint(`AUTOCHECK WARN: missing COUNTOF_$1')')