diff --git a/roles/install_nginx/tasks/main.yml b/roles/install_nginx/tasks/main.yml
index 7584dfa..218ca39 100644
--- a/roles/install_nginx/tasks/main.yml
+++ b/roles/install_nginx/tasks/main.yml
@@ -8,3 +8,12 @@
   retries: 3
   until: apt_result is succeeded
 
+- name: Add wasm to mime type
+  lineinfile:
+    path: /etc/nginx/mime.types
+    regexp: '\s*application/wasm\s+wasm;$'
+    line: '    application/wasm                      wasm;'
+    owner: root
+    group: root
+    mode: '0644'
+    insertbefore: '}'
diff --git a/roles/reverse_proxy_http/templates/nginx/sites-available/reverse_proxy b/roles/reverse_proxy_http/templates/nginx/sites-available/reverse_proxy
index 62297f3..27da41d 100644
--- a/roles/reverse_proxy_http/templates/nginx/sites-available/reverse_proxy
+++ b/roles/reverse_proxy_http/templates/nginx/sites-available/reverse_proxy
@@ -12,8 +12,11 @@ server {
 		return 302 https://$host$request_uri;
 	}
 
-    # "A man is not dead while his name is still spoken." -- Going Postal
-    add_header X-Clacks-Overhead "GNU {{ ', '.join(in_memoriam) }}";
+	include /etc/nginx/mime.types;
+	default_type application/octet-stream;
+
+	# "A man is not dead while his name is still spoken." -- Going Postal
+	add_header X-Clacks-Overhead "GNU {{ ', '.join(in_memoriam) }}";
 }
 
 server {
@@ -34,7 +37,10 @@ server {
 		include "/etc/nginx/snippets/options-proxypass.conf";
 	}
 
-    # "A man is not dead while his name is still spoken." -- Going Postal
-    add_header X-Clacks-Overhead "GNU {{ ', '.join(in_memoriam) }}";
+	include /etc/nginx/mime.types;
+	default_type application/octet-stream;
+
+	# "A man is not dead while his name is still spoken." -- Going Postal
+	add_header X-Clacks-Overhead "GNU {{ ', '.join(in_memoriam) }}";
 }
 
diff --git a/roles/share_file_web/templates/nginx/sites-available/sharing_site b/roles/share_file_web/templates/nginx/sites-available/sharing_site
index e446f2e..57c8071 100644
--- a/roles/share_file_web/templates/nginx/sites-available/sharing_site
+++ b/roles/share_file_web/templates/nginx/sites-available/sharing_site
@@ -11,8 +11,12 @@ server {
 	location / {
 		return 302 https://$host$request_uri;
 	}
-    # "A man is not dead while his name is still spoken." -- Going Postal
-    add_header X-Clacks-Overhead "GNU {{ ', '.join(in_memoriam) }}";
+
+	include /etc/nginx/mime.types;
+	default_type application/octet-stream;
+
+	# "A man is not dead while his name is still spoken." -- Going Postal
+	add_header X-Clacks-Overhead "GNU {{ ', '.join(in_memoriam) }}";
 }
 
 server {
@@ -33,7 +37,10 @@ server {
 		try_files $uri $uri.html 404;
 	}
 
-    # "A man is not dead while his name is still spoken." -- Going Postal
-    add_header X-Clacks-Overhead "GNU {{ ', '.join(in_memoriam) }}";
+	include /etc/nginx/mime.types;
+	default_type application/octet-stream;
+
+	# "A man is not dead while his name is still spoken." -- Going Postal
+	add_header X-Clacks-Overhead "GNU {{ ', '.join(in_memoriam) }}";
 }