diff --git a/parser/libapparmor_re/expr-tree.h b/parser/libapparmor_re/expr-tree.h
index b59ea8ebf..995c51ecf 100644
--- a/parser/libapparmor_re/expr-tree.h
+++ b/parser/libapparmor_re/expr-tree.h
@@ -245,6 +245,7 @@ ostream &operator<<(ostream &os, Node &node);
 #define NODE_TYPE_MATCHFLAG		(1 << 18)
 #define NODE_TYPE_EXACTMATCHFLAG	(1 << 19)
 #define NODE_TYPE_DENYMATCHFLAG		(1 << 20)
+#define NODE_TYPE_PROMPTMATCHFLAG	(1 << 21)
 
 /* An abstract node in the syntax tree. */
 class Node {
@@ -915,7 +916,10 @@ public:
 
 class PromptMatchFlag: public MatchFlag {
 public:
-	PromptMatchFlag(int priority, perm32_t prompt, perm32_t audit): MatchFlag(priority, prompt, audit) {}
+	PromptMatchFlag(int priority, perm32_t prompt, perm32_t audit): MatchFlag(priority, prompt, audit)
+	{
+		type_flags |= NODE_TYPE_PROMPTMATCHFLAG;
+	}
 };
 
 
diff --git a/parser/libapparmor_re/hfa.cc b/parser/libapparmor_re/hfa.cc
index 827d225cf..da7230914 100644
--- a/parser/libapparmor_re/hfa.cc
+++ b/parser/libapparmor_re/hfa.cc
@@ -1433,7 +1433,7 @@ int accept_perms(NodeVec *state, perms_t &perms, bool filedfa)
 		} else if (match->is_type(NODE_TYPE_DENYMATCHFLAG)) {
 			perms.deny |= match->perms;
 			perms.quiet |= match->audit;
-		} else if (dynamic_cast<PromptMatchFlag *>(match)) {
+		} else if (match->is_type(NODE_TYPE_PROMPTMATCHFLAG)) {
 			perms.prompt |= match->perms;
 			perms.audit |= match->audit;
 		} else {