diff --git a/include/spdlog/sinks/base_sink.h b/include/spdlog/sinks/base_sink.h
index 4ca51c75..be3956a7 100644
--- a/include/spdlog/sinks/base_sink.h
+++ b/include/spdlog/sinks/base_sink.h
@@ -41,6 +41,6 @@ protected:
 } // namespace sinks
 } // namespace spdlog
 
-#ifndef SPDLOG_COMPILED_LIB
+#ifdef SPDLOG_HEADER_ONLY
 #include "base_sink-inl.h"
 #endif