diff --git a/src/cmd/gc/go.y b/src/cmd/gc/go.y
index 0983ce9eb78..be445d1d936 100644
--- a/src/cmd/gc/go.y
+++ b/src/cmd/gc/go.y
@@ -720,7 +720,7 @@ pexpr:
 	{
 		$$ = nod(OCALL, $1, $3);
 	}
-|	LLEN '(' name ')'
+|	LLEN '(' expr ')'
 	{
 		$$ = nod(OLEN, $3, N);
 	}