diff --git a/src/platform_freebsd.cc b/src/platform_freebsd.cc
index 77d1b188014..0c8b2599f91 100644
--- a/src/platform_freebsd.cc
+++ b/src/platform_freebsd.cc
@@ -74,6 +74,7 @@ int OS::GetExecutablePath(char* buffer, size_t* size) {
   if (sysctl(mib, 4, buffer, size, NULL, 0) == -1) {
     return -1;
   }
+  *size-=1;
   return 0;
 }