diff --git a/build/windows/crossbuild-gitlab-ci/build-deps.sh b/build/windows/crossbuild-gitlab-ci/build-deps.sh
index 69cded67ec6460297f04d6054d738f94953a0951..34f2dfebf74c020cf64499f80f59ca8dcea03b66 100644
--- a/build/windows/crossbuild-gitlab-ci/build-deps.sh
+++ b/build/windows/crossbuild-gitlab-ci/build-deps.sh
@@ -35,12 +35,9 @@ cd ..
 
 # json-c
 
-# TODO: implicit-fallthrough and no-return-type warnings must be
-# reenabled once the following patch has been merged into json-c source:
-# https://github.com/json-c/json-c/pull/556
 git clone --depth 1 https://github.com/json-c/json-c.git && \
 mkdir json-c/_build && cd json-c/_build && \
-CFLAGS="-Wno-expansion-to-defined -Wimplicit-fallthrough=0 -Wno-return-type" crossroad ../configure && make install || exit 1
+CFLAGS="-Wno-expansion-to-defined" crossroad ../configure && make install || exit 1
 cd ../..
 
 # libmypaint