diff --git a/src/kernel/save.c b/src/kernel/save.c
index e1d6178fb..c9bdb2f2e 100644
--- a/src/kernel/save.c
+++ b/src/kernel/save.c
@@ -956,6 +956,9 @@ static region *readregion(struct gamedata *data, int x, int y)
                 break;
             res = malloc(sizeof(rawmaterial));
             res->rtype = rt_find(name);
+            if (!res->rtype && strncmp("rm_", name, 3) == 0) {
+                res->rtype = rt_find(name + 3);
+            }
             if (!res->rtype || !res->rtype->raw) {
                 log_error("invalid resourcetype %s in data.", name);
             }