diff --git a/port/stack_trace.cc b/port/stack_trace.cc
index 76866e63cc854adec1478073c9548e1031255747..296b1f6209c9040f1b8153634408a7645f889a50 100644
--- a/port/stack_trace.cc
+++ b/port/stack_trace.cc
@@ -33,7 +33,7 @@ const char* GetExecutableName() {
 
   char link[1024];
   snprintf(link, sizeof(link), "/proc/%d/exe", getpid());
-  auto read = readlink(link, name, sizeof(name));
+  auto read = readlink(link, name, sizeof(name) - 1);
   if (-1 == read) {
     return nullptr;
   } else {