diff --git a/fuzz/cmark-fuzz.c b/fuzz/cmark-fuzz.c
index 33ce23655..8ad7bc36a 100644
--- a/fuzz/cmark-fuzz.c
+++ b/fuzz/cmark-fuzz.c
@@ -55,6 +55,7 @@ int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
         }
 
         doc = cmark_parser_finish(parser);
+        cmark_parser_free(parser);
         break;
       }