diff --git a/src/util/virfile.c b/src/util/virfile.c
index d1da619666..180f2af405 100644
--- a/src/util/virfile.c
+++ b/src/util/virfile.c
@@ -810,8 +810,7 @@ int virFileLoopDeviceAssociate(const char *file,
     lo.lo_flags = LO_FLAGS_AUTOCLEAR;
 
     /* Set backing file name for LOOP_GET_STATUS64 queries */
-    if (virStrncpy((char *) lo.lo_file_name, file,
-                   strlen(file), LO_NAME_SIZE) < 0) {
+    if (virStrcpy((char *) lo.lo_file_name, file, LO_NAME_SIZE) < 0) {
         virReportSystemError(errno,
                              _("Unable to set backing file %s"), file);
         goto cleanup;