diff --git a/staging/src/k8s.io/apimachinery/pkg/util/net/http.go b/staging/src/k8s.io/apimachinery/pkg/util/net/http.go
index 41be5b2fe2..b544a60a50 100644
--- a/staging/src/k8s.io/apimachinery/pkg/util/net/http.go
+++ b/staging/src/k8s.io/apimachinery/pkg/util/net/http.go
@@ -256,8 +256,11 @@ func isDefault(transportProxier func(*http.Request) (*url.URL, error)) bool {
 // NewProxierWithNoProxyCIDR constructs a Proxier function that respects CIDRs in NO_PROXY and delegates if
 // no matching CIDRs are found
 func NewProxierWithNoProxyCIDR(delegate func(req *http.Request) (*url.URL, error)) func(req *http.Request) (*url.URL, error) {
-	// we wrap the default method, so we only need to perform our check if the NO_PROXY envvar has a CIDR in it
+	// we wrap the default method, so we only need to perform our check if the NO_PROXY (or no_proxy) envvar has a CIDR in it
 	noProxyEnv := os.Getenv("NO_PROXY")
+	if noProxyEnv == "" {
+		noProxyEnv = os.Getenv("no_proxy")
+	}
 	noProxyRules := strings.Split(noProxyEnv, ",")
 
 	cidrs := []*net.IPNet{}