diff --git a/.builds/alpine.yml b/.builds/alpine.yml
index 59346985..7f0bef02 100644
--- a/.builds/alpine.yml
+++ b/.builds/alpine.yml
@@ -30,7 +30,7 @@ tasks:
       sudo ninja -C build install
   - setup: |
       cd sway
-      meson build -Dauto_features=enabled -Dtray=disabled
+      meson build --fatal-meson-warnings -Dauto_features=enabled -Dtray=disabled
   - build: |
       cd sway
       ninja -C build
@@ -43,5 +43,5 @@ tasks:
       mkdir subprojects
       ln -s ../../wlroots subprojects/wlroots
       rm -rf build
-      meson build --default-library=static --force-fallback-for=wlroots
+      meson build --fatal-meson-warnings --default-library=static --force-fallback-for=wlroots
       ninja -C build
diff --git a/.builds/archlinux.yml b/.builds/archlinux.yml
index 05ceef8d..a8f1dfed 100644
--- a/.builds/archlinux.yml
+++ b/.builds/archlinux.yml
@@ -27,7 +27,7 @@ tasks:
       sudo ninja -C build install
   - setup: |
       cd sway
-      meson build -Dauto_features=enabled -Dsd-bus-provider=libsystemd
+      meson build --fatal-meson-warnings -Dauto_features=enabled -Dsd-bus-provider=libsystemd
   - build: |
       cd sway
       ninja -C build
diff --git a/.builds/freebsd.yml b/.builds/freebsd.yml
index 4698dbc7..1a3c8512 100644
--- a/.builds/freebsd.yml
+++ b/.builds/freebsd.yml
@@ -34,7 +34,7 @@ tasks:
     cd subprojects
     ln -s ../../wlroots wlroots
     cd ..
-    meson build -Dtray=enabled -Dsd-bus-provider=basu
+    meson build --fatal-meson-warnings -Dtray=enabled -Dsd-bus-provider=basu
 - build: |
     cd sway
     ninja -C build