diff --git a/src/options.h b/src/options.h
index 8ae89183..1ca2a8bc 100644
--- a/src/options.h
+++ b/src/options.h
@@ -195,7 +195,7 @@
 
 /** Avoid dependence from MSVC CRT and use ntdll.dll instead. */
 #ifndef MDBX_WITHOUT_MSVC_CRT
-#if !defined(MDBX_BUILD_CXX) || !MDBX_BUILD_CXX
+#if defined(MDBX_BUILD_CXX) && !MDBX_BUILD_CXX
 #define MDBX_WITHOUT_MSVC_CRT 1
 #else
 #define MDBX_WITHOUT_MSVC_CRT 0