diff --git a/src/parser/parser.yc b/src/parser/parser.yc
index 48e8aa8..8458b5e 100644
--- a/src/parser/parser.yc
+++ b/src/parser/parser.yc
@@ -575,6 +575,7 @@ asm_statement
 
 asm_expression
     : ASM LPAREN string_literals asm_operands RPAREN
+    | ASM VOLATILE LPAREN string_literals asm_operands RPAREN
     ;
 
 asm_operands