diff --git a/lua/lua.c b/lua/lua.c
index 04b3a43..62ef005 100644
--- a/lua/lua.c
+++ b/lua/lua.c
@@ -313,7 +313,8 @@ static char *readline(const char *_pcPrompt, char *_pcBuffer, int _iSize, int _i
             }
             linebuffer[len] = '\0';
 
-            char *result = strdup(linebuffer);
+            char *result = (char *)RD_MALLOC(strlen(linebuffer) + 1);
+            if (result) strcpy(result, linebuffer);
 
             if (len > 0 && strcmp(linebuffer, "exit") != 0) 
             {
@@ -529,7 +530,7 @@ int lua_repl(char *_pcBuffer, int _iSize, int _iEcho)
     } 
     else 
     {
-        RD_FREE(buffer);
+        if (buffer) RD_FREE(buffer);
         buffer = line;
         buffer_len = strlen(line);
     }
@@ -672,7 +673,7 @@ cleanup:
         RD_FREE(wrapped_code);
         wrapped_code = NULL;
     }
-    RD_FREE(buffer);
+    if (buffer) RD_FREE(buffer);
     buffer = NULL;
     lua_close(L);
     L = NULL;