diff --git a/src/include/commands/explain_dr.h b/src/include/commands/explain_dr.h
index 55da63d66bd..ce424aa2a55 100644
--- a/src/include/commands/explain_dr.h
+++ b/src/include/commands/explain_dr.h
@@ -16,7 +16,7 @@
 #include "executor/instrument.h"
 #include "tcop/dest.h"

-struct ExplainState;                   /* avoid including explain.h here */
+typedef struct ExplainState ExplainState;      /* avoid including explain.h here */