diff --git a/src/services/path-builder.spec.ts b/src/services/path-builder.spec.ts
index 1ff99982..b0721828 100644
--- a/src/services/path-builder.spec.ts
+++ b/src/services/path-builder.spec.ts
@@ -53,8 +53,9 @@ describe('Path Builder', () => {
         expect(path_builder.includes).toEqual(['include']);
     });
     it('applyParams method should add fields to get_params if they are included in the request', () => {
-        path_builder.applyParams(testService, { fields: { test: ['test_attribute'] } });
+        path_builder.applyParams(testService, { fields: { test: ['test_attribute'], test2: ['test2_attribute'] } });
         expect((path_builder as any).get_params.indexOf('fields[test]=test_attribute')).toBeGreaterThan(-1);
+        expect((path_builder as any).get_params.indexOf('fields[test2]=test2_attribute')).toBeGreaterThan(-1);
     });
     it('appendPath method should add passed value to paths array (only if value is not an empty string)', () => {
         path_builder.paths = [];
diff --git a/src/services/path-builder.ts b/src/services/path-builder.ts
index 887b5e8a..efd5ac99 100644
--- a/src/services/path-builder.ts
+++ b/src/services/path-builder.ts
@@ -17,11 +17,10 @@ export class PathBuilder {
             this.setInclude(params.include);
         }
         if (params.fields && Object.keys(params.fields).length > 0) {
-            let fields_param: string = '';
             for (let resource_type in params.fields) {
-                fields_param += `fields[${resource_type}]=${params.fields[resource_type].join(',')}`;
+                let fields_param = `fields[${resource_type}]=${params.fields[resource_type].join(',')}`;
+                this.get_params.push(fields_param);
             }
-            this.get_params.push(fields_param);
         }
     }
 
diff --git a/src/services/path-collection-builder.spec.ts b/src/services/path-collection-builder.spec.ts
index bf0966d0..09cdf4dc 100644
--- a/src/services/path-collection-builder.spec.ts
+++ b/src/services/path-collection-builder.spec.ts
@@ -63,8 +63,12 @@ describe('Path Builder', () => {
     });
 
     it('if fields are provided, they should be formatted and included in get_params', () => {
-        path_collection_builder.applyParams(testService, { fields: { test: ['test_attribute', 'other_test_attribute'] } });
+        let addParam_parent_spy = spyOn(path_collection_builder, 'addParam').and.callThrough();
+        path_collection_builder.applyParams(testService, { fields: 
+            { test: ['test_attribute', 'other_test_attribute'], test2: ['test2_attribute'] } 
+        });
         expect((path_collection_builder as any).get_params.indexOf('fields[test]=test_attribute,other_test_attribute')).toBeGreaterThan(-1);
+        expect((path_collection_builder as any).get_params.indexOf('fields[test2]=test2_attribute')).toBeGreaterThan(-1);
     });
 
     it('if page params are provided, applyParams should call addParam one or two times with the page number and size', () => {
diff --git a/src/services/path-collection-builder.ts b/src/services/path-collection-builder.ts
index 5e6b065f..ac613a5c 100644
--- a/src/services/path-collection-builder.ts
+++ b/src/services/path-collection-builder.ts
@@ -26,13 +26,6 @@ export class PathCollectionBuilder extends PathBuilder {
         if (params.sort && params.sort.length) {
             this.addParam('sort=' + params.sort.join(','));
         }
-        if (params.fields && Object.keys(params.fields).length > 0) {
-            let fields_param: string = '';
-            for (let resource_type in params.fields) {
-                fields_param += `fields[${resource_type}]=${params.fields[resource_type].join(',')}`;
-            }
-            this.addParam(fields_param);
-        }
     }
 
     private getPageConfig(): { number: string; size: string } {