diff --git a/rsa/array.c b/rsa/array.c
index ebd09d0..66947aa 100644
--- a/rsa/array.c
+++ b/rsa/array.c
@@ -2,7 +2,9 @@
 
 void array_set_random_bytes(uint32_t *n, size_t size) {
 	int fd = open("/dev/urandom", O_RDONLY);
-	read(fd, n, size);
+	if (read(fd, n, size) == -1) {
+		exit(1);
+	}
 }
 
 void array_set_msb_and_lsb_to_one(uint32_t *n, size_t size) {
diff --git a/rsa/bigint.c b/rsa/bigint.c
index 25496a4..5585c5a 100644
--- a/rsa/bigint.c
+++ b/rsa/bigint.c
@@ -6,7 +6,9 @@ void my_memcpy(void *dst, void *src, size_t n) {
 
 void bigint_set_random_bytes(bigint_t n, size_t len) {
 	int fd = open("/dev/urandom", O_RDONLY);
-	read(fd, n.data, len * sizeof(uint32_t));
+	if (read(fd, n.data, len * sizeof(uint32_t)) == -1) {
+		exit(1);
+	}
 	close(fd);
 }