diff --git a/.travis.yml b/.travis.yml
index 05fe83a7..0a6de863 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -225,7 +225,7 @@ before_deploy:
 - sudo apt-get -y install libsodium-dev
 - git clone --depth 1 https://github.com/jedisct1/minisign.git
 - cd minisign/src
-- gcc -O2 -o /tmp/bin/minisign -I/tmp/include -L/tmp/lib *.c -lsodium
+- gcc -O2 -o /tmp/bin/minisign -D_GNU_SOURCE *.c -lsodium
 - cd -
 - minisign -v
 - echo '#' > /tmp/minisign.key