diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6f6c8eca2..00366ae53 100644
--- a/CMakeLists.txt	
+++ b/CMakeLists.txt
@@ -405,7 +405,7 @@ if(WEBP_BUILD_CWEBP)
   install(TARGETS cwebp RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
 endif()
 
-if(WEBP_BUILD_GIF2WEBP OR WEBP_BUILD_IMG2WEBP)
+if(WEBP_BUILD_GIF2WEBP OR WEBP_BUILD_IMG2WEBP OR TRUE)
   parse_makefile_am(${CMAKE_CURRENT_SOURCE_DIR}/src/mux "WEBP_MUX_SRCS" "")
   add_library(libwebpmux ${WEBP_MUX_SRCS})
   target_link_libraries(libwebpmux webp)