diff --git a/cmake/subdir.cmake b/cmake/subdir.cmake
index 448f46de1..0e5645cb6 100644
--- a/cmake/subdir.cmake
+++ b/cmake/subdir.cmake
@@ -17,7 +17,7 @@ if (NOT ENABLE_CPP_20)
   Set(BUILD_STRUCT_JSON ON)
   Set(BUILD_STRUCT_XML ON)
   Set(BUILD_STRUCT_YAML ON)
-  Set(BUILD_STRUCT_PB ON)
+  Set(BUILD_STRUCT_PB OFF)
 endif()
 
 foreach(child ${children})