diff --git a/build/cmake/util.cmake b/build/cmake/util.cmake
index 7897e92..d1f0d02 100644
--- a/build/cmake/util.cmake
+++ b/build/cmake/util.cmake
@@ -25,6 +25,7 @@
        "// Generated file. DO NOT EDIT!\n"
        "// ${target_name} needs a ${extension} file to force link language, \n"
        "// or to silence a harmless CMake warning: Ignore me.\n"
+       "void aom_${target_name}_dummy_function(void);\n"
        "void aom_${target_name}_dummy_function(void) {}\n")
   list(APPEND "${out_file_list_var}" "${dummy_source_file}")
 endmacro()