diff --git a/lib/rb/ext/strlcpy.c b/lib/rb/ext/strlcpy.c
new file mode 100644
index 0000000..3996950
--- /dev/null
+++ b/lib/rb/ext/strlcpy.c
@@ -0,0 +1,44 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+#include <string.h>
+
+#ifndef HAVE_STRLCPY
+#define HAVE_STRLCPY
+
+size_t
+strlcpy (char *dst, const char *src, size_t dst_sz)
+{
+    size_t n;
+
+    for (n = 0; n < dst_sz; n++) {
+      if ((*dst++ = *src++) == '\0')
+        break;
+    }
+
+    if (n < dst_sz)
+      return n;
+    if (n > 0)
+      *(dst - 1) = '\0';
+    return n + strlen (src);
+}
+#else
+extern size_t strlcpy(char *, const char *, size_t);
+#endif
+