diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 41fdbf30b1c17b2b04a4bccd8c55c7b60dd81fe7..0574c69a46a89b8db88864fa679f32760d2dc925 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -24058,7 +24058,7 @@ virDomainDiskSourceFormat(virBufferPtr buf,
 }
 
 
-static int
+int
 virDomainDiskBackingStoreFormat(virBufferPtr buf,
                                 virStorageSourcePtr src,
                                 virDomainXMLOptionPtr xmlopt,
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index 79d9802373826819a0fd95209a17550f4a6abee5..48b0af4b041fa9483052aaef329976ff92fd099a 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -3073,6 +3073,12 @@ int virDomainDiskSourceFormat(virBufferPtr buf,
                               unsigned int flags,
                               virDomainXMLOptionPtr xmlopt);
 
+int
+virDomainDiskBackingStoreFormat(virBufferPtr buf,
+                                virStorageSourcePtr src,
+                                virDomainXMLOptionPtr xmlopt,
+                                unsigned int flags);
+
 int virDomainNetDefFormat(virBufferPtr buf,
                           virDomainNetDefPtr def,
                           char *prefix,
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 96ad468b8b09cd41ccbe807bdeee84de5e4fc71b..dff97bd82a7c4008182d8debf808a82b4fa5d760 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -311,6 +311,7 @@ virDomainDeviceInfoIterate;
 virDomainDeviceSetData;
 virDomainDeviceTypeToString;
 virDomainDeviceValidateAliasForHotplug;
+virDomainDiskBackingStoreFormat;
 virDomainDiskBackingStoreParse;
 virDomainDiskBusTypeToString;
 virDomainDiskByAddress;