diff --git a/lib/filesystem.c b/lib/filesystem.c
index 6da52df..a246836 100644
--- a/lib/filesystem.c
+++ b/lib/filesystem.c
@@ -8,7 +8,9 @@ int filesystem_read(char *path, char **file_content, off_t *file_size) {
   (*file_size) = lseek(file_descriptor, 0, SEEK_END);
   lseek(file_descriptor, 0, SEEK_SET);
   (*file_content) = malloc(*file_size);
-  read(file_descriptor, *file_content, *file_size);
+  if (read(file_descriptor, *file_content, *file_size) == -1) {
+    return -1;
+  }
   close(file_descriptor);
   return 0;
 }
@@ -18,7 +20,9 @@ int filesystem_write(char *path, char *file_content, off_t file_size) {
   if (file_descriptor == -1) {
     return -1;
   }
-  write(file_descriptor, file_content, file_size);
+  if (write(file_descriptor, file_content, file_size) == -1) {
+    return -1;
+  }
   close(file_descriptor);
   return 0;
 }
diff --git a/lib/filesystem.h b/lib/filesystem.h
index cab4e48..2f697b9 100644
--- a/lib/filesystem.h
+++ b/lib/filesystem.h
@@ -19,8 +19,8 @@
  * @param file_content
  * @param file_size
  * @return int
- * @retval -1 if the file does not exist
- * @retval 0 for success
+ * @retval -1 if the file does not exist or if there is an error.
+ * @retval 0 for success.
  * @since v1.0.0
  */
 int filesystem_read(char *path, char **file_content, off_t *file_size);
@@ -32,8 +32,8 @@ int filesystem_read(char *path, char **file_content, off_t *file_size);
  * @param file_content
  * @param file_size
  * @return int
- * @retval -1 if errors
- * @retval 0 for success
+ * @retval -1 if there is an error.
+ * @retval 0 for success.
  * @since v1.0.0
  */
 int filesystem_write(char *path, char *file_content, off_t file_size);