diff --git a/modules/openapi-generator/src/main/resources/rust/reqwest-trait/api.mustache b/modules/openapi-generator/src/main/resources/rust/reqwest-trait/api.mustache
index e54ac68e968..e86f6442757 100644
--- a/modules/openapi-generator/src/main/resources/rust/reqwest-trait/api.mustache
+++ b/modules/openapi-generator/src/main/resources/rust/reqwest-trait/api.mustache
@@ -216,9 +216,18 @@ impl {{classname}} for {{classname}}Client {
         {{/isExplode}}
         {{/isDeepObject}}
         {{^isDeepObject}}
+        {{#isObject}}
+        {{^isModel}}
+        if let Some(ref param_value) = {{{paramName}}} {
+            local_var_req_builder = local_var_req_builder.query(&[("{{{baseName}}}", &serde_json::to_value(param_value)?)]);
+        };
+        {{/isModel}}
+        {{/isObject}}
+        {{^isObject}}
         if let Some(ref param_value) = {{{paramName}}} {
             local_var_req_builder = local_var_req_builder.query(&[("{{{baseName}}}", &param_value.to_string())]);
         };
+        {{/isObject}}
         {{/isDeepObject}}
         {{/isNullable}}
         {{/isArray}}
@@ -250,7 +259,14 @@ impl {{classname}} for {{classname}}Client {
             {{/isExplode}}
             {{/isDeepObject}}
             {{^isDeepObject}}
+            {{#isObject}}
+            {{^isModel}}
+            local_var_req_builder = local_var_req_builder.query(&[("{{{baseName}}}", &serde_json::to_value(param_value)?)]);
+            {{/isModel}}
+            {{/isObject}}
+            {{^isObject}}
             local_var_req_builder = local_var_req_builder.query(&[("{{{baseName}}}", &param_value.to_string())]);
+            {{/isObject}}
             {{/isDeepObject}}
         }
         {{/required}}
diff --git a/modules/openapi-generator/src/main/resources/rust/reqwest/api.mustache b/modules/openapi-generator/src/main/resources/rust/reqwest/api.mustache
index 9c73fc5c39d..987a691b4f7 100644
--- a/modules/openapi-generator/src/main/resources/rust/reqwest/api.mustache
+++ b/modules/openapi-generator/src/main/resources/rust/reqwest/api.mustache
@@ -179,10 +179,19 @@ pub {{#supportAsync}}async {{/supportAsync}}fn {{{operationId}}}(configuration:
     };
     {{/isDeepObject}}
     {{^isDeepObject}}
+    {{#isObject}}
+    {{^isModel}}
+    if let Some(ref param_value) = {{{vendorExtensions.x-rust-param-identifier}}} {
+        req_builder = req_builder.query(&[("{{{baseName}}}", &serde_json::to_string(param_value)?)]);
+    };
+    {{/isModel}}
+    {{/isObject}}
+    {{/isDeepObject}}
+    {{^isObject}}
     if let Some(ref param_value) = {{{vendorExtensions.x-rust-param-identifier}}} {
         req_builder = req_builder.query(&[("{{{baseName}}}", &param_value.to_string())]);
     };
-    {{/isDeepObject}}
+    {{/isObject}}
     {{/isNullable}}
     {{/isArray}}
     {{/required}}
@@ -214,7 +223,14 @@ pub {{#supportAsync}}async {{/supportAsync}}fn {{{operationId}}}(configuration:
         {{/isExplode}}
         {{/isDeepObject}}
         {{^isDeepObject}}
+        {{#isObject}}
+        {{^isModel}}
+        req_builder = req_builder.query(&[("{{{baseName}}}", &serde_json::to_string(param_value)?)]);
+        {{/isModel}}
+        {{/isObject}}
+        {{^isObject}}
         req_builder = req_builder.query(&[("{{{baseName}}}", &param_value.to_string())]);
+        {{/isObject}}
         {{/isDeepObject}}
         {{/isArray}}
     }