diff --git a/src/bhyve/bhyve_capabilities.c b/src/bhyve/bhyve_capabilities.c
index c04a475375..f80cf7be62 100644
--- a/src/bhyve/bhyve_capabilities.c
+++ b/src/bhyve/bhyve_capabilities.c
@@ -116,9 +116,7 @@ virBhyveDomainCapsFill(virDomainCapsPtr caps,
     }
 
     caps->hostdev.supported = VIR_TRISTATE_BOOL_NO;
-    caps->iothreads = VIR_TRISTATE_BOOL_NO;
-    caps->vmcoreinfo = VIR_TRISTATE_BOOL_NO;
-    caps->genid = VIR_TRISTATE_BOOL_NO;
+    virDomainCapsFeaturesInitUnsupported(caps);
     caps->gic.supported = VIR_TRISTATE_BOOL_NO;
 
     return 0;
diff --git a/src/conf/domain_capabilities.c b/src/conf/domain_capabilities.c
index d13fdc0054..df48be4994 100644
--- a/src/conf/domain_capabilities.c
+++ b/src/conf/domain_capabilities.c
@@ -309,6 +309,20 @@ virDomainCapsEnumClear(virDomainCapsEnumPtr capsEnum)
 }
 
 
+/**
+ * @caps: domain caps
+ *
+ * Initializes all features in 'caps' as unsupported.
+ */
+void
+virDomainCapsFeaturesInitUnsupported(virDomainCapsPtr caps)
+{
+    caps->iothreads = VIR_TRISTATE_BOOL_NO;
+    caps->vmcoreinfo = VIR_TRISTATE_BOOL_NO;
+    caps->genid = VIR_TRISTATE_BOOL_NO;
+}
+
+
 static int
 virDomainCapsEnumFormat(virBufferPtr buf,
                         const virDomainCapsEnum *capsEnum,
diff --git a/src/conf/domain_capabilities.h b/src/conf/domain_capabilities.h
index 8bfc6ccccb..03192b6f40 100644
--- a/src/conf/domain_capabilities.h
+++ b/src/conf/domain_capabilities.h
@@ -225,6 +225,8 @@ int virDomainCapsEnumSet(virDomainCapsEnumPtr capsEnum,
                          unsigned int *values);
 void virDomainCapsEnumClear(virDomainCapsEnumPtr capsEnum);
 
+void virDomainCapsFeaturesInitUnsupported(virDomainCapsPtr caps);
+
 char * virDomainCapsFormat(const virDomainCaps *caps);
 
 int virDomainCapsDeviceDefValidate(const virDomainCaps *caps,
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index c706553e37..95c5b60871 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -202,6 +202,7 @@ virDomainCapsCPUUsableTypeToString;
 virDomainCapsDeviceDefValidate;
 virDomainCapsEnumClear;
 virDomainCapsEnumSet;
+virDomainCapsFeaturesInitUnsupported;
 virDomainCapsFormat;
 virDomainCapsNew;
 virSEVCapabilitiesFree;
diff --git a/src/libxl/libxl_capabilities.c b/src/libxl/libxl_capabilities.c
index fe792e9a82..55f6b490ec 100644
--- a/src/libxl/libxl_capabilities.c
+++ b/src/libxl/libxl_capabilities.c
@@ -764,9 +764,8 @@ libxlMakeDomainCapabilities(virDomainCapsPtr domCaps,
         libxlMakeDomainDeviceHostdevCaps(hostdev) < 0)
         return -1;
 
-    domCaps->iothreads = VIR_TRISTATE_BOOL_NO;
-    domCaps->vmcoreinfo = VIR_TRISTATE_BOOL_NO;
-    domCaps->genid = VIR_TRISTATE_BOOL_NO;
+    virDomainCapsFeaturesInitUnsupported(domCaps);
+
     domCaps->gic.supported = VIR_TRISTATE_BOOL_NO;
 
     return 0;