diff --git a/repos/ports/src/virtualbox5/network.cpp b/repos/ports/src/virtualbox5/network.cpp
index d3dcf4488a..9f1095a558 100644
--- a/repos/ports/src/virtualbox5/network.cpp
+++ b/repos/ports/src/virtualbox5/network.cpp
@@ -336,7 +336,7 @@ class Nic_client
 static DECLCALLBACK(int) drvNicNetworkUp_BeginXmit(PPDMINETWORKUP pInterface, bool fOnWorkerThread)
 {
 	PDRVNIC pThis = PDMINETWORKUP_2_DRVNIC(pInterface);
-	int rc = RTCritSectTryEnter(&pThis->XmitLock);
+	int rc = RTCritSectEnter(&pThis->XmitLock);
 	if (RT_FAILURE(rc))
 		rc = VERR_TRY_AGAIN;
 	return rc;
diff --git a/repos/ports/src/virtualbox6/network.cc b/repos/ports/src/virtualbox6/network.cc
index f8f836ac96..6634ea6776 100644
--- a/repos/ports/src/virtualbox6/network.cc
+++ b/repos/ports/src/virtualbox6/network.cc
@@ -351,7 +351,7 @@ class Nic_client
 static DECLCALLBACK(int) drvNicNetworkUp_BeginXmit(PPDMINETWORKUP pInterface, bool fOnWorkerThread)
 {
 	PDRVNIC pThis = PDMINETWORKUP_2_DRVNIC(pInterface);
-	int rc = RTCritSectTryEnter(&pThis->XmitLock);
+	int rc = RTCritSectEnter(&pThis->XmitLock);
 	if (RT_FAILURE(rc))
 		rc = VERR_TRY_AGAIN;
 	return rc;