diff --git a/src/seeder/dns.cpp b/src/seeder/dns.cpp
--- a/src/seeder/dns.cpp
+++ b/src/seeder/dns.cpp
@@ -64,6 +64,9 @@
 
 int parse_name(const uint8_t **inpos, const uint8_t *inend,
                const uint8_t *inbuf, char *buf, size_t bufsize) {
+    if (bufsize == 0) {
+        return -2;
+    }
     size_t bufused = 0;
     int init = 1;
     do {
diff --git a/src/seeder/test/seeder_tests.cpp b/src/seeder/test/seeder_tests.cpp
--- a/src/seeder/test/seeder_tests.cpp
+++ b/src/seeder/test/seeder_tests.cpp
@@ -64,7 +64,7 @@
     }
 
     // Output buffer size testing
-    for (size_t outputBufferSize = 1;
+    for (size_t outputBufferSize = 0;
          outputBufferSize < MAX_QUERY_NAME_BUFFER_LENGTH; outputBufferSize++) {
         std::vector<char> parsedQueryName(outputBufferSize, 0);
         const uint8_t *nameFieldBegin = nameField.data();