diff --git a/include/boost/stacktrace/stacktrace.hpp b/include/boost/stacktrace/stacktrace.hpp
index aad99ca..3a584e0 100644
--- a/include/boost/stacktrace/stacktrace.hpp
+++ b/include/boost/stacktrace/stacktrace.hpp
@@ -37,7 +37,7 @@
 
 extern "C" {
 
-#if defined(BOOST_STACKTRACE_DYN_LINK) && defined(BOOST_STACKTRACE_INTERNAL_BUILD_LIBS)
+#if defined(BOOST_STACKTRACE_DYN_LINK) && !defined(BOOST_STACKTRACE_INTERNAL_BUILD_LIBS)
 BOOST_SYMBOL_EXPORT
 #endif
 inline void* boost_stacktrace_impl_return_nullptr() { return nullptr; }