diff --git a/configure.ac b/configure.ac
index 6920b536a4..4fd24cffe3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -532,6 +532,7 @@ AC_SUBST(GIT_COMMIT_VERSION_HASH)
 AX_CHECK_COMPILE_FLAG([-fassociative-math -fno-signed-zeros -fno-trapping-math -freciprocal-math],HAVE_ASSOC_MATH=yes)
 AM_CONDITIONAL(ASSOC_MATH_AVAILABLE, test "x$HAVE_ASSOC_MATH" = "xyes")
 
+AC_SUBST(FLAC_STATIC_LIBS) dnl unused here
 
 AC_CONFIG_FILES([ \
 	Makefile \