diff --git a/config/apache/standardebooks.org.conf b/config/apache/standardebooks.org.conf
index f11ac7ac..25f2d7dd 100644
--- a/config/apache/standardebooks.org.conf
+++ b/config/apache/standardebooks.org.conf
@@ -12,6 +12,7 @@ AddType			image/avif .avif
 AddType			font/woff2 .woff2
 AddOutputFilterByType	deflate	image/svg+xml
 AddOutputFilterByType	deflate	application/xhtml+xml
+AddOutputFilterByType	deflate image/vnd.microsoft.icon image/x-icon
 TraceEnable		off
 Protocols		h2 h2c http/1.1
 
diff --git a/config/apache/standardebooks.test.conf b/config/apache/standardebooks.test.conf
index cc16b37d..12e8ffc5 100644
--- a/config/apache/standardebooks.test.conf
+++ b/config/apache/standardebooks.test.conf
@@ -12,6 +12,7 @@ AddType			image/avif .avif
 AddType			font/woff2 .woff2
 AddOutputFilterByType	deflate	image/svg+xml
 AddOutputFilterByType	deflate	application/xhtml+xml
+AddOutputFilterByType	deflate image/vnd.microsoft.icon image/x-icon
 TraceEnable		off
 Protocols		h2 h2c http/1.1