diff --git a/src/google/protobuf/port_def.inc b/src/google/protobuf/port_def.inc
index 56f995e45e..3feef35b77 100644
--- a/src/google/protobuf/port_def.inc
+++ b/src/google/protobuf/port_def.inc
@@ -904,7 +904,8 @@ static_assert(PROTOBUF_ABSL_MIN(20230125, 3),
 #pragma warning(disable: 4125)
 #endif
 
-#if PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII
+#if defined(PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII) && \
+    PROTOBUF_ENABLE_DEBUG_LOGGING_MAY_LEAK_PII
 #define PROTOBUF_DEBUG true
 #else
 #define PROTOBUF_DEBUG false