diff --git a/libs/vkd3d-shader/vkd3d_shader_main.c b/libs/vkd3d-shader/vkd3d_shader_main.c
index c7161e44..7548b90a 100644
--- a/libs/vkd3d-shader/vkd3d_shader_main.c
+++ b/libs/vkd3d-shader/vkd3d_shader_main.c
@@ -120,8 +120,8 @@ static char *vkd3d_shader_message_context_copy_messages(struct vkd3d_shader_mess
 {
     char *messages;
 
-    if ((messages = vkd3d_malloc(context->messages.content_size)))
-        memcpy(messages, context->messages.buffer, context->messages.content_size);
+    if ((messages = vkd3d_malloc(context->messages.content_size + 1)))
+        memcpy(messages, context->messages.buffer, context->messages.content_size + 1);
 
     return messages;
 }