diff --git a/src/add-ons/kernel/file_systems/nfs4/kernel_interface.cpp b/src/add-ons/kernel/file_systems/nfs4/kernel_interface.cpp
index a4c689754b..52c943a59f 100644
--- a/src/add-ons/kernel/file_systems/nfs4/kernel_interface.cpp
+++ b/src/add-ons/kernel/file_systems/nfs4/kernel_interface.cpp
@@ -167,15 +167,17 @@ nfs4_mount(fs_volume* volume, const char* device, uint32 flags,
 
 	/* prepare idmapper server */
 	MutexLocker locker(gIdMapperLock);
-	gIdMapper = new(std::nothrow) IdMap;
-	if (gIdMapper == NULL)
-		return B_NO_MEMORY;
+	if (gIdMapper == NULL) {
+		gIdMapper = new(std::nothrow) IdMap;
+		if (gIdMapper == NULL)
+			return B_NO_MEMORY;
 
-	result = gIdMapper->InitStatus();
-	if (result != B_OK) {
-		delete gIdMapper;
-		gIdMapper = NULL;
-		return result;
+		result = gIdMapper->InitStatus();
+		if (result != B_OK) {
+			delete gIdMapper;
+			gIdMapper = NULL;
+			return result;
+		}
 	}
 	locker.Unlock();