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-rw-r--r--include/ruby/ruby.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/ruby/ruby.h b/include/ruby/ruby.h
index 7bfc0b261c8..575a2b61fce 100644
--- a/include/ruby/ruby.h
+++ b/include/ruby/ruby.h
@@ -1266,7 +1266,7 @@ void rb_gc_writebarrier_unprotect_promoted(VALUE obj);
#define OBJ_WRITE(a, slot, b) rb_obj_write((VALUE)(a), (VALUE *)(slot), (VALUE)(b), __FILE__, __LINE__)
#define OBJ_WRITTEN(a, oldv, b) rb_obj_written((VALUE)(a), (VALUE)(oldv), (VALUE)(b), __FILE__, __LINE__)
-#if USE_RGENGC_LOGGING_WB_UNPROTECT
+#if defined(USE_RGENGC_LOGGING_WB_UNPROTECT) && USE_RGENGC_LOGGING_WB_UNPROTECT
void rb_gc_unprotect_logging(void *objptr, const char *filename, int line);
#define RGENGC_LOGGING_WB_UNPROTECT rb_gc_unprotect_logging
#endif