diff --git a/rust/src/parser.rs b/rust/src/parser.rs
index d7ae41946c..a094fbc9b4 100644
--- a/rust/src/parser.rs
+++ b/rust/src/parser.rs
@@ -171,5 +171,6 @@ pub const APP_LAYER_PARSER_BYPASS_READY : u8 = 0b1000;
 
 extern {
     pub fn AppLayerParserStateSetFlag(state: *mut c_void, flag: u8);
+    pub fn AppLayerParserStateIssetFlag(state: *mut c_void, flag: u8) -> c_int;
     pub fn AppLayerParserConfParserEnabled(ipproto: *const c_char, proto: *const c_char) -> c_int;
 }