diff --git a/cmake/QtInternalTargets.cmake b/cmake/QtInternalTargets.cmake
index 5e1ea19ea0d..bcfa8124596 100644
--- a/cmake/QtInternalTargets.cmake
+++ b/cmake/QtInternalTargets.cmake
@@ -333,6 +333,9 @@ endif()
 
 if(QT_FEATURE_stack_protector)
     target_compile_options(PlatformCommonInternal INTERFACE -fstack-protector-strong)
+    if(CMAKE_SYSTEM_NAME STREQUAL "SunOS")
+        target_link_libraries(PlatformCommonInternal INTERFACE ssp)
+    endif()
 endif()
 
 if(QT_FEATURE_stack_clash_protection)