diff --git a/setup/config/config_global.go b/setup/config/config_global.go
index ef2b09113..3b8fee529 100644
--- a/setup/config/config_global.go
+++ b/setup/config/config_global.go
@@ -62,6 +62,7 @@ func (c *Global) Defaults() {
 
 	c.Kafka.Defaults()
 	c.Metrics.Defaults()
+	c.Caches.Defaults()
 }
 
 func (c *Global) Verify(configErrs *ConfigErrors, isMonolith bool) {
@@ -70,6 +71,7 @@ func (c *Global) Verify(configErrs *ConfigErrors, isMonolith bool) {
 
 	c.Kafka.Verify(configErrs, isMonolith)
 	c.Metrics.Verify(configErrs, isMonolith)
+	c.Caches.Verify(configErrs, isMonolith)
 }
 
 type OldVerifyKeys struct {
@@ -153,4 +155,5 @@ func (c *Caches) Defaults() {
 }
 
 func (c *Caches) Verify(configErrs *ConfigErrors, isMonolith bool) {
+	checkPositive(configErrs, "global.caches.federationsender_cache_size", int64(c.FederationSenderEventCacheSize))
 }