diff --git a/src/core/NetworkManagerUtils.c b/src/core/NetworkManagerUtils.c
index fdb2b40443..e057f5534b 100644
--- a/src/core/NetworkManagerUtils.c
+++ b/src/core/NetworkManagerUtils.c
@@ -28,6 +28,7 @@
 
 #include "libnm-platform/nm-platform.h"
 #include "libnm-platform/nm-linux-platform.h"
+#include "libnm-platform/nm-platform-utils.h"
 #include "nm-auth-utils.h"
 #include "libnm-systemd-shared/nm-sd-utils-shared.h"
 
@@ -1750,6 +1751,12 @@ nm_utils_platform_capture_ip_setting(NMPlatform *platform,
             continue;
         }
 
+        if (route->rx.rt_source
+            != nmp_utils_ip_config_source_round_trip_rtprot(NM_IP_CONFIG_SOURCE_USER)) {
+            /* Ignore routes provided by external sources */
+            continue;
+        }
+
         s_route = nm_ip_route_new_binary(addr_family,
                                          route->rx.network_ptr,
                                          route->rx.plen,