diff --git a/CHANGELOG.md b/CHANGELOG.md
index b819742925f..21ecee3dcdc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -17,6 +17,7 @@ IMPROVEMENTS:
 
 BUG FIXES:
  * agent: Only allow querying Prometheus formatted metrics if Prometheus is enabled within the config [[GH-10140](https://github.com/hashicorp/nomad/pull/10140)]
+ * api: Fixed race condition around headers in API client [[GH-10302](https://github.com/hashicorp/nomad/issues/10302)]
  * api: Added missing devices block to AllocatedTaskResources [[GH-10064](https://github.com/hashicorp/nomad/pull/10064)]
  * cli: Fixed a bug where non-int proxy port would panic CLI [[GH-10072](https://github.com/hashicorp/nomad/issues/10072)]
  * cli: Fixed a bug where `nomad operator debug` incorrectly parsed https Consul API URLs. [[GH-10082](https://github.com/hashicorp/nomad/pull/10082)]
diff --git a/api/api.go b/api/api.go
index d2deff27478..7ce7d9a1368 100644
--- a/api/api.go
+++ b/api/api.go
@@ -685,8 +685,8 @@ func (c *Client) newRequest(method, path string) (*request, error) {
 		}
 	}
 
-	if c.config.Headers != nil {
-		r.header = c.config.Headers
+	for key, values := range c.config.Headers {
+		r.header[key] = values
 	}
 
 	return r, nil
diff --git a/vendor/github.com/hashicorp/nomad/api/api.go b/vendor/github.com/hashicorp/nomad/api/api.go
index d2deff27478..7ce7d9a1368 100644
--- a/vendor/github.com/hashicorp/nomad/api/api.go
+++ b/vendor/github.com/hashicorp/nomad/api/api.go
@@ -685,8 +685,8 @@ func (c *Client) newRequest(method, path string) (*request, error) {
 		}
 	}
 
-	if c.config.Headers != nil {
-		r.header = c.config.Headers
+	for key, values := range c.config.Headers {
+		r.header[key] = values
 	}
 
 	return r, nil