diff --git a/modules/http_server_simple/simple_web_server_request.cpp b/modules/http_server_simple/simple_web_server_request.cpp
index 8f3e3511b..e8814f2e8 100644
--- a/modules/http_server_simple/simple_web_server_request.cpp
+++ b/modules/http_server_simple/simple_web_server_request.cpp
@@ -256,7 +256,7 @@ void SimpleWebServerRequest::set_parser_path(const String &value) {
 		}
 
 		String key = cp.substr_index(0, eq);
-		String val = cp.substr_index(eq + 1, cp.size());
+		String val = cp.substr_index(eq + 1, cp.length());
 
 		if (key.empty() || val.empty()) {
 			// &=v&  or  &p=&