diff --git a/x/fbridge/module/abci.go b/x/fbridge/module/abci.go
index ed98b5d579..8af018af32 100644
--- a/x/fbridge/module/abci.go
+++ b/x/fbridge/module/abci.go
@@ -1,6 +1,7 @@
 package module
 
 import (
+	"fmt"
 	sdk "github.com/Finschia/finschia-sdk/types"
 	"github.com/Finschia/finschia-sdk/x/fbridge/keeper"
 	"github.com/Finschia/finschia-sdk/x/fbridge/types"
@@ -39,3 +40,29 @@ func EndBlocker(ctx sdk.Context, k keeper.Keeper) {
 		}
 	}
 }
+
+// RegisterInvariants registers the fbridge module invariants
+func RegisterInvariants(ir sdk.InvariantRegistry, k keeper.Keeper) {
+	ir.RegisterRoute(types.ModuleName, "guardian-invariant", GuardianInvariant(k))
+}
+
+func GuardianInvariant(k keeper.Keeper) sdk.Invariant {
+	return func(ctx sdk.Context) (string, bool) {
+
+		numGuardian := 0
+		for _, p := range k.GetRolePairs(ctx) {
+			if p.Role == types.RoleGuardian {
+				numGuardian++
+			}
+		}
+
+		numBridgeSw := len(k.GetBridgeSwitches(ctx))
+
+		broken := numGuardian != numBridgeSw
+
+		return sdk.FormatInvariant(
+			types.ModuleName, "guardian-invariant",
+			fmt.Sprintf("number of guardians(%d) != number of bridge switches(%d)", numGuardian, numBridgeSw),
+		), broken
+	}
+}
diff --git a/x/fbridge/module/module.go b/x/fbridge/module/module.go
index 0aa135ca74..2f5464557e 100644
--- a/x/fbridge/module/module.go
+++ b/x/fbridge/module/module.go
@@ -136,7 +136,9 @@ func (am AppModule) EndBlock(ctx sdk.Context, _ abci.RequestEndBlock) []abci.Val
 }
 
 // RegisterInvariants does nothing, there are no invariants to enforce
-func (am AppModule) RegisterInvariants(ir sdk.InvariantRegistry) {}
+func (am AppModule) RegisterInvariants(ir sdk.InvariantRegistry) {
+	RegisterInvariants(ir, am.keeper)
+}
 
 // Deprecated: Route does nothing.
 func (am AppModule) Route() sdk.Route { return sdk.NewRoute("", nil) }