diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0380dd95eec..ce91a79767b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@
 #### Bugs
 * Fix #1796: Check if BouncyCastle provider is set
 * Fix #1724: createOrReplace function does not work properly for Custom defined resources
+* Fix #1803: Missing "/" in request url while using customresource client
 * Fix #1789: Create or replace on operation seems broken
 * Fix #1782: Informer Deadlock; Fix lock typo in SharedProcessor
 
@@ -11,6 +12,7 @@
 * Fix #1797: Utils.waitUntilReady should record the stack trace of the caller before rethrowing an exception
 * Add support for filtering labels by EXISTS/NOT_EXISTS via the single argument versions of `.withLabel` and `.withoutLabel`
 * Schedule reconnect in case of HTTP_GONE when watching; the rescheduled connect will start from beginning of history by not specifying resourceVersion
+
 #### Dependency Upgrade
 * Updated Knative Serving to v0.9.90
 * Update Tekton to v0.7.0
diff --git a/kubernetes-client/src/main/java/io/fabric8/kubernetes/client/dsl/internal/RawCustomResourceOperationsImpl.java b/kubernetes-client/src/main/java/io/fabric8/kubernetes/client/dsl/internal/RawCustomResourceOperationsImpl.java
index a14c4920c89..fa7b67634fb 100644
--- a/kubernetes-client/src/main/java/io/fabric8/kubernetes/client/dsl/internal/RawCustomResourceOperationsImpl.java
+++ b/kubernetes-client/src/main/java/io/fabric8/kubernetes/client/dsl/internal/RawCustomResourceOperationsImpl.java
@@ -536,7 +536,13 @@ private String fetchUrl(String name, String namespace, Map<String, String> label
   }
 
   private String fetchUrl(String namespace, Map<String, String> labels) {
+    if (config.getMasterUrl() == null) {
+      return null;
+    }
+
     StringBuilder urlBuilder = new StringBuilder(config.getMasterUrl());
+
+    urlBuilder.append(config.getMasterUrl().endsWith("/") ? "" : "/");
     urlBuilder.append("apis/")
       .append(customResourceDefinition.getGroup())
       .append("/")