diff --git a/configure.ac b/configure.ac
index 1b7af2b9..10e110fa 100644
--- a/configure.ac
+++ b/configure.ac
@@ -273,6 +273,7 @@ Shared libraries: ${enable_shared}
 Static libraries: ${enable_static}
 Threaded decode: ${enable_threading-no}
 libwebp: yes
+libwebpdemux: ${enable_experimental_libwebpdemux-no}
 libwebpmux: ${enable_experimental_libwebpmux-no}
 
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