diff --git a/src/basic/in-addr-util.h b/src/basic/in-addr-util.h
index 2dafa3c084..2f64c31f96 100644
--- a/src/basic/in-addr-util.h
+++ b/src/basic/in-addr-util.h
@@ -65,7 +65,9 @@ static inline size_t FAMILY_ADDRESS_SIZE(int family) {
         return family == AF_INET6 ? 16 : 4;
 }
 
-#define IN_ADDR_NULL ((union in_addr_union) {})
+/* Workaround for clang, explicitly specify the maximum-size element here.
+ * See also oss-fuzz#11344. */
+#define IN_ADDR_NULL ((union in_addr_union) { .in6 = {} })
 
 void in_addr_data_hash_func(const void *p, struct siphash *state);
 int in_addr_data_compare_func(const void *a, const void *b);
diff --git a/src/network/networkd-route.c b/src/network/networkd-route.c
index e8cde66bef..21b5de3f26 100644
--- a/src/network/networkd-route.c
+++ b/src/network/networkd-route.c
@@ -364,10 +364,10 @@ void route_update(Route *route,
         assert(route);
         assert(src || src_prefixlen == 0);
 
-        route->src = src ? *src : (union in_addr_union) {};
+        route->src = src ? *src : IN_ADDR_NULL;
         route->src_prefixlen = src_prefixlen;
-        route->gw = gw ? *gw : (union in_addr_union) {};
-        route->prefsrc = prefsrc ? *prefsrc : (union in_addr_union) {};
+        route->gw = gw ? *gw : IN_ADDR_NULL;
+        route->prefsrc = prefsrc ? *prefsrc : IN_ADDR_NULL;
         route->scope = scope;
         route->protocol = protocol;
         route->type = type;
diff --git a/test/fuzz/fuzz-netdev-parser/oss-fuzz-11344 b/test/fuzz/fuzz-netdev-parser/oss-fuzz-11344
new file mode 100644
index 0000000000..e3744c608c
--- /dev/null
+++ b/test/fuzz/fuzz-netdev-parser/oss-fuzz-11344
@@ -0,0 +1,6 @@
+[NetDev]
+Name=v
+Kind=vti
+[Tunnel]
+Local=::
+Local=any
\ No newline at end of file