diff --git a/transport-native-epoll/src/main/c/netty_epoll_native.c b/transport-native-epoll/src/main/c/netty_epoll_native.c
index 14cc12f4ec1b..1bd165d5a54e 100644
--- a/transport-native-epoll/src/main/c/netty_epoll_native.c
+++ b/transport-native-epoll/src/main/c/netty_epoll_native.c
@@ -315,7 +315,9 @@ static jstring netty_epoll_native_kernelVersion(JNIEnv* env, jclass clazz) {
 }
 
 static jboolean netty_epoll_native_isSupportingSendmmsg(JNIEnv* env, jclass clazz) {
-    if (sendmmsg) {
+    // Use & to avoid warnings with -Wtautological-pointer-compare when sendmmsg is
+    // not weakly defined.
+    if (&sendmmsg != NULL) {
         return JNI_TRUE;
     }
     return JNI_FALSE;
diff --git a/transport-native-unix-common/src/main/c/netty_unix_socket.c b/transport-native-unix-common/src/main/c/netty_unix_socket.c
index 4ada12740d70..38efb85b4e93 100644
--- a/transport-native-unix-common/src/main/c/netty_unix_socket.c
+++ b/transport-native-unix-common/src/main/c/netty_unix_socket.c
@@ -581,7 +581,7 @@ static jint netty_unix_socket_connectDomainSocket(JNIEnv* env, jclass clazz, jin
 static jint netty_unix_socket_recvFd(JNIEnv* env, jclass clazz, jint fd) {
     int socketFd;
     struct msghdr descriptorMessage = { 0 };
-    struct iovec iov[1] = { 0 };
+    struct iovec iov[1] = { { 0 } };
     char control[CMSG_SPACE(sizeof(int))] = { 0 };
     char iovecData[1];
 
@@ -629,7 +629,7 @@ static jint netty_unix_socket_recvFd(JNIEnv* env, jclass clazz, jint fd) {
 
 static jint netty_unix_socket_sendFd(JNIEnv* env, jclass clazz, jint socketFd, jint fd) {
     struct msghdr descriptorMessage = { 0 };
-    struct iovec iov[1] = { 0 };
+    struct iovec iov[1] = { { 0 } };
     char control[CMSG_SPACE(sizeof(int))] = { 0 };
     char iovecData[1];