diff --git a/concurrency-webserver/src/spin.c b/concurrency-webserver/src/spin.c
index 7f04d6b..c4faaa6 100644
--- a/concurrency-webserver/src/spin.c
+++ b/concurrency-webserver/src/spin.c
@@ -42,8 +42,8 @@ int main(int argc, char *argv[]) {
     sprintf(content, "%s<p>I spun for %.2f seconds</p>\r\n", content, t2 - t1);
     
     /* Generate the HTTP response */
-    printf("Content-length: %lu\r\n", strlen(content));
-    printf("Content-type: text/html\r\n\r\n");
+    printf("Content-Length: %lu\r\n", strlen(content));
+    printf("Content-Type: text/html\r\n\r\n");
     printf("%s", content);
     fflush(stdout);