diff --git a/boost/context/fixedsize_stack.hpp b/boost/context/fixedsize_stack.hpp
index 681de40..32fef70 100644
--- a/boost/context/fixedsize_stack.hpp
+++ b/boost/context/fixedsize_stack.hpp
@@ -9,6 +9,7 @@
 
 #include <cstddef>
 #include <cstdlib>
+#include <cstring>
 #include <new>
 
 #include <boost/assert.hpp>
@@ -47,6 +48,8 @@ public:
         void * vp = std::malloc( size_);
         if ( ! vp) throw std::bad_alloc();
 
+        std::memset(vp, 0, size_);
+
         stack_context sctx;
         sctx.size = size_;
         sctx.sp = static_cast< char * >( vp) + sctx.size;