diff --git a/include/boost/test/impl/execution_monitor.ipp b/include/boost/test/impl/execution_monitor.ipp
index 9929f74b53..ce2551a226 100644
--- a/include/boost/test/impl/execution_monitor.ipp
+++ b/include/boost/test/impl/execution_monitor.ipp
@@ -155,8 +155,11 @@ namespace { void _set_se_translator( void* ) {} }
 #    include <android/api-level.h>
 #  endif
 
+// BOOST_TEST_DISABLE_ALT_STACK is available in case you're crosscompiling a
+// target like ESXi which has no proper flag and doesn't support the alt stack.
 #  if !defined(__CYGWIN__) && !defined(__QNXNTO__) && !defined(__bgq__) && \
-   (!defined(__ANDROID__) || __ANDROID_API__ >= 8)
+   (!defined(__ANDROID__) || __ANDROID_API__ >= 8) && \
+   !defined(BOOST_TEST_DISABLE_ALT_STACK)
 #    define BOOST_TEST_USE_ALT_STACK
 #  endif