travis: Add -Werror=return-type

Signed-off-by: Petr Vorel <pvorel@suse.cz>

1 files changed, 1 insertions, 1 deletions

diff --git a/build.sh b/build.sh
index becaf3619..7fd9683a8 100755
--- a/build.sh
+++ b/build.sh
@@ -9,7 +9,7 @@
 
 set -e
 
-CFLAGS="${CFLAGS:--Wformat -Werror=format-security -Werror=implicit-function-declaration -fno-common}"
+CFLAGS="${CFLAGS:--Wformat -Werror=format-security -Werror=implicit-function-declaration -Werror=return-type -fno-common}"
 CC="${CC:-gcc}"
 
 DEFAULT_PREFIX="$HOME/ltp-install"