diff --git a/src/interfaces/ecpg/preproc/pgc.l b/src/interfaces/ecpg/preproc/pgc.l
index 4d31f3bbe40..f2e7eddf86e 100644
--- a/src/interfaces/ecpg/preproc/pgc.l
+++ b/src/interfaces/ecpg/preproc/pgc.l
@@ -1355,6 +1355,7 @@ parse_include(void)
 			/* if the command was "include_next" we have to disregard the first hit */
 			if (yyin && include_next)
 			{
+				fclose (yyin);
 				yyin = NULL;
 				include_next = false;
 			}