diff --git a/src/nm-core-utils.c b/src/nm-core-utils.c
index 5b3cc72a1f..b20653838d 100644
--- a/src/nm-core-utils.c
+++ b/src/nm-core-utils.c
@@ -2558,14 +2558,7 @@ _get_property_path (const char *ifname,
 	                  ipv6 ? IPV6_PROPERTY_DIR : IPV4_PROPERTY_DIR,
 	                  ifname,
 	                  property);
-
-	/* Ubuntu: don't assert, but log about the inconsistent size. */
-	if (len > sizeof (path) - 1) {
-	    nm_log_warn (LOGD_CORE,
-	                 "IPv6 property path is too long: '"
-	                 IPV6_PROPERTY_DIR "%s/%s'",
-	                 ifname, property);
-	}
+	g_assert (len < sizeof (path) - 1);
 
 	return path;
 }
@@ -2629,15 +2622,9 @@ NM_ASSERT_VALID_PATH_COMPONENT (const char *name)
 
 	nm_log_err (LOGD_CORE, "Failed asserting path component: %s%s%s",
 	            NM_PRINT_FMT_QUOTED (name, "\"", name, "\"", "(null)"));
-
-	/* Ubuntu: Don't outright fail, just return the name again. It's
-	 * logged as being invalid, which is enough.
-	 * There is a use of slashes in paths for oFono modems, which are
-	 * actually valid paths to refer to an oFono modem, just don't map to
-	 * anything on the filesystem. The following calls to sysctl paths can
-	 * (and will) fail, but that's fine.
-	 */
-	return name;
+	g_error ("FATAL: Failed asserting path component: %s%s%s",
+	         NM_PRINT_FMT_QUOTED (name, "\"", name, "\"", "(null)"));
+	g_assert_not_reached ();
 }
 
 gboolean