diff --git a/src/include/c.h b/src/include/c.h
index 2c61ca8aa8..b768d6fcf1 100644
--- a/src/include/c.h
+++ b/src/include/c.h
@@ -565,7 +565,7 @@ struct varlena
 	char		vl_dat[FLEXIBLE_ARRAY_MEMBER];	/* Data content is here */
 };
 
-#define VARHDRSZ		((int32) sizeof(int32))
+#define VARHDRSZ		(sizeof(int32))
 
 /*
  * These widely-used datatypes are just a varlena header and the data bytes.