diff --git a/assembler/gram.y b/assembler/gram.y
index 9cca8ddf..b5ffc1d4 100644
--- a/assembler/gram.y
+++ b/assembler/gram.y
@@ -507,8 +507,11 @@ imm32reg:	imm32 srcimmtype
 		}
 ;
 
-/* XXX: accreg regtype */
 directsrcaccoperand:	directsrcoperand
+		| accreg regtype
+		{
+		  set_src_operand(&$$, &$1, $2);
+		}
 ;
 
 /* Returns a source operand in the src0 fields of an instruction. */