diff --git a/CMakeLists.txt b/CMakeLists.txt
index 93113b6fc4..47c1458625 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -66,7 +66,6 @@ set(BRPC_COMMON_COMPILE_OPTIONS)
 set(BRPC_COMMON_DEFINITIONS)
 set(BRPC_COMMON_INCLUDE_DIRS
     ${PROJECT_SOURCE_DIR}/src
-    ${CMAKE_CURRENT_BINARY_DIR}
 )
 set(BRPC_COMMON_LINK_OPTIONS)
 set(BRPC_CXX_STANDARD 14)
@@ -417,6 +416,10 @@ endif()
 list(REMOVE_DUPLICATES BRPC_COMMON_INCLUDE_DIRS)
 
 add_library(brpc_common_config INTERFACE)
+# Generated protobuf headers live in the build directory. Search it before src/
+# so leftover in-source *.pb.h (gitignored, produced by Make) cannot shadow
+# updated .proto files such as errno.proto.
+target_include_directories(brpc_common_config BEFORE INTERFACE ${CMAKE_CURRENT_BINARY_DIR})
 target_include_directories(brpc_common_config INTERFACE ${BRPC_COMMON_INCLUDE_DIRS})
 target_compile_definitions(brpc_common_config INTERFACE ${BRPC_COMMON_DEFINITIONS})
 target_compile_options(brpc_common_config INTERFACE ${BRPC_COMMON_COMPILE_OPTIONS})