diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 9a0c7fc769..2edf12365d 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -7796,7 +7796,7 @@ virDomainDefHasMemoryHotplug(const virDomainDef *def)
  * or the sum of memory sizes of NUMA nodes in case NUMA is enabled in @def.
  */
 unsigned long long
-virDomainDefGetMemoryInitial(virDomainDefPtr def)
+virDomainDefGetMemoryInitial(const virDomainDef *def)
 {
     return def->mem.initial_memory;
 }
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index fd4ef823b1..f10b5348b7 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -2325,7 +2325,7 @@ struct _virDomainDef {
     xmlNodePtr metadata;
 };
 
-unsigned long long virDomainDefGetMemoryInitial(virDomainDefPtr def);
+unsigned long long virDomainDefGetMemoryInitial(const virDomainDef *def);
 void virDomainDefSetMemoryTotal(virDomainDefPtr def, unsigned long long size);
 void virDomainDefSetMemoryInitial(virDomainDefPtr def, unsigned long long size);
 unsigned long long virDomainDefGetMemoryActual(virDomainDefPtr def);