diff --git a/src/libvirt.c b/src/libvirt.c
index 05c0a87e13d740186fe68143d4d456ca85ee65e5..8f94b118417cba7f0c6f6be65e446890ce78d885 100644
--- a/src/libvirt.c
+++ b/src/libvirt.c
@@ -10300,7 +10300,7 @@ virConnectFindStoragePoolSources(virConnectPtr conn,
                                  unsigned int flags)
 {
     VIR_DEBUG("conn=%p, type=%s, src=%s, flags=%x",
-              conn, type ? type : "", srcSpec ? srcSpec : "", flags);
+              conn, NULLSTR(type), NULLSTR(srcSpec), flags);
 
     virResetLastError();