diff --git a/internal/config/config.go b/internal/config/config.go
index 9cbcee0..a6258d1 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -2,6 +2,8 @@ package config
 
 import (
 	"flag"
+	"fmt"
+	"os"
 )
 
 // Config represents user supplied program input
@@ -30,4 +32,11 @@ func (c *Config) LoadAndValidate() {
 	flag.BoolVar(&c.IsProofWriter, "p", true, "Disable proof wrtier (default: Enabled)")
 
 	flag.Parse()
+
+	// Check if mandatory flags are set
+	if c.InputPath == "" {
+		fmt.Println("Error: -i flag is mandatory")
+		flag.Usage()
+		os.Exit(1)
+	}
 }