diff --git a/src/test/regress/bin/normalize.sed b/src/test/regress/bin/normalize.sed
index 06729bd16..e3df83fa4 100644
--- a/src/test/regress/bin/normalize.sed
+++ b/src/test/regress/bin/normalize.sed
@@ -378,3 +378,7 @@ s/\<is referenced from table\>/is still referenced from table/g
 
 # PG18: EXPLAIN ANALYZE prints "Index Searches: N" for index scans — remove it
 /^\s*Index Searches:\s*\d+\s*$/d
+
+# EXPLAIN (PG18+): hide Materialize storage instrumentation
+# this rule can be removed when PG18 is the minimum supported version
+/^[ \t]*Storage:[ \t].*$/d