diff --git a/src/conf/domain_addr.c b/src/conf/domain_addr.c
index c7eab0c8af..9883c4f3d4 100644
--- a/src/conf/domain_addr.c
+++ b/src/conf/domain_addr.c
@@ -825,7 +825,7 @@ virDomainVirtioSerialAddrFindController(virDomainVirtioSerialAddrSetPtr addrs,
  * Adds virtio serial ports of the existing controller
  * to the address set.
  */
-int
+static int
 virDomainVirtioSerialAddrSetAddController(virDomainVirtioSerialAddrSetPtr addrs,
                                           virDomainControllerDefPtr cont)
 {
diff --git a/src/conf/domain_addr.h b/src/conf/domain_addr.h
index 74f414ead5..208635c2d2 100644
--- a/src/conf/domain_addr.h
+++ b/src/conf/domain_addr.h
@@ -206,10 +206,6 @@ typedef virDomainVirtioSerialAddrSet *virDomainVirtioSerialAddrSetPtr;
 virDomainVirtioSerialAddrSetPtr
 virDomainVirtioSerialAddrSetCreate(void);
 int
-virDomainVirtioSerialAddrSetAddController(virDomainVirtioSerialAddrSetPtr addrs,
-                                          virDomainControllerDefPtr cont)
-    ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2);
-int
 virDomainVirtioSerialAddrSetAddControllers(virDomainVirtioSerialAddrSetPtr addrs,
                                            virDomainDefPtr def)
     ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2);
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 407c6ff11f..f90a1a4284 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -111,7 +111,6 @@ virDomainVirtioSerialAddrAutoAssign;
 virDomainVirtioSerialAddrIsComplete;
 virDomainVirtioSerialAddrRelease;
 virDomainVirtioSerialAddrReserve;
-virDomainVirtioSerialAddrSetAddController;
 virDomainVirtioSerialAddrSetAddControllers;
 virDomainVirtioSerialAddrSetCreate;
 virDomainVirtioSerialAddrSetFree;