diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index bc8dfa7e2..7cbd958ae 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -8,6 +8,7 @@ on:
 
 env:
   CARGO_TERM_COLOR: always
+  RUSTFLFAGS: "-D warnings"
 
 jobs:
   build:
diff --git a/josh-filter/src/bin/josh-filter.rs b/josh-filter/src/bin/josh-filter.rs
index 7dd81e57f..9f6622ef4 100644
--- a/josh-filter/src/bin/josh-filter.rs
+++ b/josh-filter/src/bin/josh-filter.rs
@@ -1,4 +1,3 @@
-#![deny(warnings)]
 #![warn(unused_extern_crates)]
 
 #[macro_use]
diff --git a/josh-proxy/src/bin/josh-proxy.rs b/josh-proxy/src/bin/josh-proxy.rs
index 839fb271a..ee772845a 100644
--- a/josh-proxy/src/bin/josh-proxy.rs
+++ b/josh-proxy/src/bin/josh-proxy.rs
@@ -1,4 +1,3 @@
-#![deny(warnings)]
 #[macro_use]
 extern crate lazy_static;
 
diff --git a/tester.sh b/tester.sh
index 895b6dad0..8788d74f6 100755
--- a/tester.sh
+++ b/tester.sh
@@ -48,6 +48,7 @@ if [[ ! -v CARGO_TARGET_DIR ]]; then
     exit 1
 fi
 
+export RUSTFLFAGS="-D warnings"
 cargo build --workspace --exclude josh-ui --features hyper_cgi/test-server
 ( cd josh-ssh-dev-server ; go build -o "\${CARGO_TARGET_DIR}/josh-ssh-dev-server" )
 sh run-tests.sh ${TESTS}