diff --git a/server/request_handling.c b/server/request_handling.c
index b9925a2..6b3e909 100644
--- a/server/request_handling.c
+++ b/server/request_handling.c
@@ -106,29 +106,32 @@ void free_request_line_items(struct request_line *parsed_line) {
  *
  * @return -1 For an I/O error, 0 if successful.
  */
-int get_file_from_uri(const char *uri, struct requested_file *req_file) {
+enum file_result get_file_from_uri(const char *uri, struct requested_file *req_file) {
     const char *resource = uri;
     if (strcmp(uri, "/") == 0) {
         resource = "TMDG.html";
     } else if (*uri == '/') {
         // If our uri starts with a slash, we can ignore it.
-        uri++;
+        resource++;
     }
 
     struct stat file_stat;
     int stat_result = stat(resource, &file_stat);
     if (stat_result == -1) {
-        return -1;
+        return RESULT_IO_ERROR;
+    }
+    if (S_ISDIR(file_stat.st_mode)) {
+        return RESULT_NOT_FILE;
     }
 
     FILE *open_file = fopen(resource, "r");
     if (open_file == NULL) {
-        return -1;
+        return RESULT_IO_ERROR;
     }
 
     rewind(open_file);
     req_file->size = file_stat.st_size;
     req_file->file = open_file;
 
-    return 0;
+    return RESULT_FILE_OK;
 }
diff --git a/server/request_handling.h b/server/request_handling.h
index b2d5cb6..7eace14 100644
--- a/server/request_handling.h
+++ b/server/request_handling.h
@@ -3,6 +3,8 @@
 
 #include <stdio.h>
 
+enum file_result{RESULT_IO_ERROR, RESULT_NOT_FILE, RESULT_FILE_OK};
+
 struct request_line {
     char *http_version;
     char *method;
@@ -16,6 +18,6 @@ struct requested_file {
 
 int parse_request_line(const char *line, struct request_line *parsed_line);
 void free_request_line_items(struct request_line *parsed_line);
-int get_file_from_uri(const char *uri, struct requested_file *req_file);
+enum file_result get_file_from_uri(const char *uri, struct requested_file *req_file);
 
 #endif
diff --git a/server/socket_server.c b/server/socket_server.c
index 5a016a1..bb8adc6 100644
--- a/server/socket_server.c
+++ b/server/socket_server.c
@@ -247,11 +247,11 @@ enum socket_result serve_one_request(int sock_fd) {
     // Attempt to read the file and return it.
     struct requested_file file = {};
     int file_result = get_file_from_uri(parsed_request_line.uri, &file);
-    if (file_result == -1) {
+    if (file_result != RESULT_FILE_OK) {
         int send_result = 0;
-        if (errno == ENOENT) {
+        if (file_result == RESULT_NOT_FILE || (file_result == RESULT_IO_ERROR && errno == ENOENT)) {
             send_result = send_headers(404, client_fd, -1);
-        } else if (errno == EACCES) {
+        } else if (file_result == RESULT_IO_ERROR && errno == EACCES) {
             send_result = send_headers(403, client_fd, -1);
         } else {
             free_request_line_items(&parsed_request_line);
@@ -275,7 +275,7 @@ enum socket_result serve_one_request(int sock_fd) {
     }
     free_request_line_items(&parsed_request_line);
     free_request_items(message);
-    if (file_result != -1) {
+    if (file_result == RESULT_FILE_OK) {
         fclose(file.file);
     }