diff --git a/tests/auto/corelib/io/qprocess/testProcessCrash/main.cpp b/tests/auto/corelib/io/qprocess/testProcessCrash/main.cpp
index 1441c8ed0c8..ddf0ef0ad79 100644
--- a/tests/auto/corelib/io/qprocess/testProcessCrash/main.cpp
+++ b/tests/auto/corelib/io/qprocess/testProcessCrash/main.cpp
@@ -2,6 +2,22 @@
 // Copyright (C) 2020 Intel Corporation.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
 
+#if __has_include(<sys/resource.h>)
+#  include <sys/resource.h>
+#  if defined(RLIMIT_CORE)
+static bool disableCoreDumps()
+{
+    // Unix: set our core dump limit to zero to request no dialogs.
+    if (struct rlimit rlim; getrlimit(RLIMIT_CORE, &rlim) == 0) {
+        rlim.rlim_cur = 0;
+        setrlimit(RLIMIT_CORE, &rlim);
+    }
+    return true;
+}
+static bool disabledCoreDumps = disableCoreDumps();
+#  endif // RLIMIT_CORE
+#endif // <sys/resource.h>
+
 void crashFallback(volatile int *ptr = nullptr)
 {
     *ptr = 0;
diff --git a/tests/auto/network/socket/qtcpserver/crashingServer/main.cpp b/tests/auto/network/socket/qtcpserver/crashingServer/main.cpp
index 08f234aa3e0..1fe9f78a329 100644
--- a/tests/auto/network/socket/qtcpserver/crashingServer/main.cpp
+++ b/tests/auto/network/socket/qtcpserver/crashingServer/main.cpp
@@ -8,15 +8,23 @@
 #  include <crtdbg.h>
 #endif
 #ifdef Q_OS_UNIX
+#  include <sys/resource.h>
 #  include <unistd.h>
 #endif
 
 int main(int argc, char *argv[])
 {
-     // Windows: Suppress crash notification dialog.
 #if defined(Q_OS_WIN) && defined(Q_CC_MSVC)
+    // Windows: Suppress crash notification dialog.
     _CrtSetReportMode(_CRT_ERROR, _CRTDBG_MODE_DEBUG);
+#elif defined(RLIMIT_CORE)
+    // Unix: set our core dump limit to zero to request no dialogs.
+    if (struct rlimit rlim; getrlimit(RLIMIT_CORE, &rlim) == 0) {
+        rlim.rlim_cur = 0;
+        setrlimit(RLIMIT_CORE, &rlim);
+    }
 #endif
+
     QCoreApplication app(argc, argv);
 
     QTcpServer server;
diff --git a/tests/auto/testlib/selftests/crashes/tst_crashes.cpp b/tests/auto/testlib/selftests/crashes/tst_crashes.cpp
index abac42c7232..38ed27d331a 100644
--- a/tests/auto/testlib/selftests/crashes/tst_crashes.cpp
+++ b/tests/auto/testlib/selftests/crashes/tst_crashes.cpp
@@ -7,6 +7,8 @@
 
 #ifdef Q_OS_WIN
 #include <qt_windows.h>
+#else
+#include <sys/resource.h>
 #endif
 
 class tst_Crashes: public QObject
@@ -22,6 +24,12 @@ void tst_Crashes::crash()
 #if defined(Q_OS_WIN)
    //we avoid the error dialogbox to appear on windows
    SetErrorMode( SEM_NOGPFAULTERRORBOX | SEM_FAILCRITICALERRORS | SEM_NOOPENFILEERRORBOX);
+#elif defined(RLIMIT_CORE)
+    // Unix: set our core dump limit to zero to request no dialogs.
+    if (struct rlimit rlim; getrlimit(RLIMIT_CORE, &rlim) == 0) {
+        rlim.rlim_cur = 0;
+        setrlimit(RLIMIT_CORE, &rlim);
+    }
 #endif
     /*
         We deliberately dereference an invalid but non-zero address;