diff --git a/ChangeLog.d/fix_compilation_ssl_tests.txt b/ChangeLog.d/fix_compilation_ssl_tests.txt
new file mode 100644
index 000000000..202e5c439
--- /dev/null
+++ b/ChangeLog.d/fix_compilation_ssl_tests.txt
@@ -0,0 +1,3 @@
+Bugfix
+   * Fix an uninitialized variable warning in test_suite_ssl.function with GCC
+     version 11.
diff --git a/tests/suites/test_suite_ssl.function b/tests/suites/test_suite_ssl.function
index b18ed423d..74e60ae08 100644
--- a/tests/suites/test_suite_ssl.function
+++ b/tests/suites/test_suite_ssl.function
@@ -2248,8 +2248,8 @@ exit:
 void ssl_mock_sanity( )
 {
     enum { MSGLEN = 105 };
-    unsigned char message[MSGLEN];
-    unsigned char received[MSGLEN];
+    unsigned char message[MSGLEN] = { 0 };
+    unsigned char received[MSGLEN] = { 0 };
     mbedtls_mock_socket socket;
 
     mbedtls_mock_socket_init( &socket );