diff --git a/main.c b/main.c
index 68cc409..f088a07 100644
--- a/main.c
+++ b/main.c
@@ -23,6 +23,7 @@
 #include "simdata.h"
 #include "stdint.h"
 #include <unistd.h>
+#include <errno.h>
 
 void help(char* progname){
 	printf("Usage: %s  -i <file> \n", progname);
@@ -54,6 +55,13 @@ int main(int argc, char* argd[] ){
 
 	/// READ ROM FILE ///
 	FILE* rom=fopen(infile,"r");
+
+	if (rom == NULL) {
+		printf("ERROR: Couldn't open rom file\n");
+		perror(infile);
+		return 1;
+	}
+
 	fseek(rom, 0, SEEK_END);
 	if(ftell(rom)!=16777216){
 		printf("ERROR: ROM file isn't 16MiB\n");