diff --git a/scripts/libwebp/build.sh b/scripts/libwebp/build.sh
index 1d49799..6056502 100644
--- a/scripts/libwebp/build.sh
+++ b/scripts/libwebp/build.sh
@@ -11,6 +11,8 @@
     AR=${FAM_AR} \
     RANLIB=${FAM_RANLIB} || exit 1
 
+export FFMPEG_EXTRA_LD_FLAGS="${FFMPEG_EXTRA_LD_FLAGS} -lm"
+
 ${MAKE_EXECUTABLE} clean
 ${MAKE_EXECUTABLE} -j${HOST_NPROC}
 ${MAKE_EXECUTABLE} install