diff --git a/vmhost/contexts/runtime.go b/vmhost/contexts/runtime.go
index f2da057d8..be17ab097 100644
--- a/vmhost/contexts/runtime.go
+++ b/vmhost/contexts/runtime.go
@@ -789,6 +789,10 @@ func (context *runtimeContext) CountSameContractInstancesOnStack(address []byte)
 // FunctionNameChecked returns the function name, after checking that it exists in the contract.
 func (context *runtimeContext) FunctionNameChecked() (string, error) {
 	functionName := context.FunctionName()
+	err := verifyCallFunction(functionName)
+	if err != nil {
+		return "", executor.ErrFuncNotFound
+	}
 	if context.HasFunction(functionName) {
 		return functionName, nil
 	}
diff --git a/vmhost/contexts/validator.go b/vmhost/contexts/validator.go
index 3cd1ee137..33114c775 100644
--- a/vmhost/contexts/validator.go
+++ b/vmhost/contexts/validator.go
@@ -62,6 +62,20 @@ func (validator *wasmValidator) verifyProtectedFunctions(instance executor.Insta
 }
 
 func (validator *wasmValidator) verifyValidFunctionName(functionName string) error {
+	err := verifyCallFunction(functionName)
+	if err != nil {
+		return err
+	}
+
+	errInvalidName := fmt.Errorf("%w: %x", vmhost.ErrInvalidFunctionName, functionName)
+	if validator.reserved.IsReserved(functionName) {
+		return errInvalidName
+	}
+
+	return nil
+}
+
+func verifyCallFunction(functionName string) error {
 	const maxLengthOfFunctionName = 256
 
 	errInvalidName := fmt.Errorf("%w: %s", vmhost.ErrInvalidFunctionName, functionName)
@@ -78,9 +92,6 @@ func (validator *wasmValidator) verifyValidFunctionName(functionName string) err
 	if !validCharactersOnly(functionName) {
 		return errInvalidName
 	}
-	if validator.reserved.IsReserved(functionName) {
-		return errInvalidName
-	}
 
 	return nil
 }