diff --git a/src/base/system.c b/src/base/system.c
index 1787e30ac..79aab5386 100644
--- a/src/base/system.c
+++ b/src/base/system.c
@@ -3219,6 +3219,7 @@ PROCESS shell_execute(const char *file)
 #if defined(CONF_FAMILY_WINDOWS)
 	SHELLEXECUTEINFOA info;
 	mem_zero(&info, sizeof(SHELLEXECUTEINFOA));
+	info.cbSize = sizeof(SHELLEXECUTEINFOA);
 	info.lpVerb = "open";
 	info.lpFile = file;
 	info.nShow = SW_SHOWDEFAULT;