diff --git a/src/tools/qtwaylandscanner/Qt6WaylandClientMacros.cmake b/src/tools/qtwaylandscanner/Qt6WaylandClientMacros.cmake
index f81812d2df5..7b103fd6d97 100644
--- a/src/tools/qtwaylandscanner/Qt6WaylandClientMacros.cmake
+++ b/src/tools/qtwaylandscanner/Qt6WaylandClientMacros.cmake
@@ -14,12 +14,12 @@ function(qt6_generate_wayland_protocol_client_sources target)
         add_custom_command(
             OUTPUT "${waylandscanner_header_output}"
             #TODO: Maybe put the files in ${CMAKE_CURRENT_BINARY_DIR/wayland_generated instead?
-            COMMAND Wayland::Scanner --include-core-only client-header < "${protocol_file}" > "${waylandscanner_header_output}"
+            COMMAND Wayland::Scanner --strict --include-core-only client-header < "${protocol_file}" > "${waylandscanner_header_output}"
         )
 
         add_custom_command(
             OUTPUT "${waylandscanner_code_output}"
-            COMMAND Wayland::Scanner --include-core-only public-code < "${protocol_file}" > "${waylandscanner_code_output}"
+            COMMAND Wayland::Scanner --strict --include-core-only public-code < "${protocol_file}" > "${waylandscanner_code_output}"
         )
 
         # TODO: Make this less hacky
diff --git a/src/tools/qtwaylandscanner/Qt6WaylandCompositorMacros.cmake b/src/tools/qtwaylandscanner/Qt6WaylandCompositorMacros.cmake
index 0a1241a6d04..51e76b4d7eb 100644
--- a/src/tools/qtwaylandscanner/Qt6WaylandCompositorMacros.cmake
+++ b/src/tools/qtwaylandscanner/Qt6WaylandCompositorMacros.cmake
@@ -13,11 +13,11 @@ function(qt6_generate_wayland_protocol_server_sources target)
         add_custom_command(
             OUTPUT "${waylandscanner_header_output}"
             #TODO: Maybe put the files in ${CMAKE_CURRENT_BINARY_DIR/wayland_generated instead?
-            COMMAND Wayland::Scanner --include-core-only server-header < "${protocol_file}" > "${waylandscanner_header_output}"
+            COMMAND Wayland::Scanner --strict --include-core-only server-header < "${protocol_file}" > "${waylandscanner_header_output}"
         )
         add_custom_command(
             OUTPUT "${waylandscanner_code_output}"
-            COMMAND Wayland::Scanner --include-core-only public-code < "${protocol_file}" > "${waylandscanner_code_output}"
+            COMMAND Wayland::Scanner --strict --include-core-only public-code < "${protocol_file}" > "${waylandscanner_code_output}"
         )
 
         # TODO: make this less hacky