diff --git a/src/corelib/Qt6WasmMacros.cmake b/src/corelib/Qt6WasmMacros.cmake
index 38722d1b17c..989f3dde50e 100644
--- a/src/corelib/Qt6WasmMacros.cmake
+++ b/src/corelib/Qt6WasmMacros.cmake
@@ -135,8 +135,12 @@ function(_qt_internal_wasm_export_name_for_target out target)
     if(export_name)
         set(${out} "${export_name}" PARENT_SCOPE)
     else()
-        string(REGEX REPLACE "[^a-zA-Z0-9_]" "_" target "${target}")
-        set(${out} "${target}_entry" PARENT_SCOPE)
+        string(REGEX MATCH "[^a-zA-Z_]" has_invalid_char "${target}")
+        if(has_invalid_char)
+            set(${out} "_${target}_entry" PARENT_SCOPE)
+        else()
+            set(${out} "${target}_entry" PARENT_SCOPE)
+        endif()
     endif()
 endfunction()