diff --git a/csim.c b/csim.c
index b007cb4..bab4fde 100644
--- a/csim.c
+++ b/csim.c
@@ -27,7 +27,7 @@ int main(int argc, char* argv[])
 {
 	size_t set_index_bits = 0, lines = 0, block_bits = 0; // Useful variables.
 	char *filename = NULL;
-	int opt = 0, argflags = 0;
+	int opt = 0;
 	while ((opt=getopt(argc, argv, "hvs:E:b:t:")) != -1) {
 		switch (opt) {
 			/* TODO: maybe add checking for optarg swallowing actual arguments. */
@@ -35,7 +35,7 @@ int main(int argc, char* argv[])
 			VERBOSE = 1;
 			break;
 		case 's': // 2^s = number of sets
-			index_bits = parse_int_arg(optarg, 's');
+			set_index_bits = parse_int_arg(optarg, 's');
 			break;
 		case 'E': // associativity - lines per set
 			lines = parse_int_arg(optarg, 'E');
@@ -55,12 +55,12 @@ int main(int argc, char* argv[])
 		}
 	}
 	/* If any required arguments were not provided. (argflags != 0b1111) */
-	if (!index_bits || !lines || !block_bits || !filename) {
+	if (!set_index_bits || !lines || !block_bits || !filename) {
 		printf("Usage: ./csim [-hv] -s <number> -E <number> -b <number> -t <file>\n");
 		return 1;
 	}
 	/* End of argument parsing. */
-	printf("Arguments: %zd, %zd, %zd, %hd, %s\n", index_bits, lines, block_bits, VERBOSE, filename);
+	printf("Arguments: %zd, %zd, %zd, %hd, %s\n", set_index_bits, lines, block_bits, VERBOSE, filename);
 
 	printSummary(0, 0, 0);
 	return 0;