diff --git a/doctest/parts/doctest.cpp b/doctest/parts/doctest.cpp
index a76193b..e96a858 100644
--- a/doctest/parts/doctest.cpp
+++ b/doctest/parts/doctest.cpp
@@ -1627,7 +1627,7 @@ namespace {
         static bool             isSet;
         static struct sigaction oldSigActions[DOCTEST_COUNTOF(signalDefs)];
         static stack_t          oldSigStack;
-        static char             altStackMem[4 * SIGSTKSZ];
+        static char             altStackMem[32768];
 
         static void handleSignal(int sig) {
             const char* name = "<unknown signal>";