diff --git a/include/spdlog_setup/details/conf_impl.h b/include/spdlog_setup/details/conf_impl.h
index 2f6da6d0..8f7b2b5c 100644
--- a/include/spdlog_setup/details/conf_impl.h
+++ b/include/spdlog_setup/details/conf_impl.h
@@ -6,7 +6,7 @@
 
 #pragma once
 
-#ifndef FMT_HEADER_ONLY
+#if !defined(SPDLOG_COMPILED_LIB) && !defined(FMT_HEADER_ONLY)
 #define FMT_HEADER_ONLY
 #endif