diff --git a/main.c b/main.c
index 7a2450a..7955f76 100644
--- a/main.c
+++ b/main.c
@@ -72,6 +72,11 @@ int main(int argc, char* argd[] ){
 	/// READ INPUT FILE ///
 	FILE* rom=fopen(infile,"r");
 
+	if(!rom){
+		printf("Couldn't open input file %s\n",infile);
+		return 1;
+	}
+
 	struct simdata_t *simdata = init_simdata();
 	if(!simdata){
 		printf("Couldn't allocate memory\n");