diff --git a/highlight.h b/highlight.h
index 3d4a4fe8e..339929cf3 100644
--- a/highlight.h
+++ b/highlight.h
@@ -71,7 +71,7 @@
 #define HIGHLIGHT_AUTOSUGGESTION 0x2000
 
 class history_item_t;
-class file_detection_context_t;
+struct file_detection_context_t;
 
 /**
    Perform syntax highlighting for the shell commands in buff. The result is