diff --git a/projects/gnupg/fuzz_list.c b/projects/gnupg/fuzz_list.c
index 07fc1db94..8e1e0034b 100644
--- a/projects/gnupg/fuzz_list.c
+++ b/projects/gnupg/fuzz_list.c
@@ -71,6 +71,9 @@ static void rmrfdir(char *path)
     }
 }
 
+// 65kb should be enough ;-)
+#define MAX_LEN 0x10000
+
 int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
     IOBUF a;
     armor_filter_context_t *afx = NULL;
@@ -132,6 +135,11 @@ int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
         initialized = true;
     }
 
+    if (Size > MAX_LEN) {
+        // limit maximum size to avoid long computing times
+        Size = MAX_LEN;
+    }
+
     memset(ctrlGlobal, 0, sizeof(*ctrlGlobal));
     ctrlGlobal->magic = SERVER_CONTROL_MAGIC;