diff --git a/.github/workflows/build-rpi3.yml b/.github/workflows/build_rpi3.yml
similarity index 81%
rename from .github/workflows/build-rpi3.yml
rename to .github/workflows/build_rpi3.yml
index 0ca74521..9c10123e 100644
--- a/.github/workflows/build-rpi3.yml
+++ b/.github/workflows/build_rpi3.yml
@@ -4,9 +4,17 @@ on:
   push:
     branches:
       - master
+    paths-ignore:
+      - 'utils/**'
+      - 'doc/**'
+      - 'docker/**'
   pull_request:
     branches:
       - master
+    paths-ignore:
+      - 'utils/**'
+      - 'doc/**'
+      - 'docker/**'
   schedule:
     - cron: '0 5 * * *'
 
diff --git a/.github/workflows/check_fmt.yml b/.github/workflows/check_fmt.yml
index 9434a45b..15451b74 100644
--- a/.github/workflows/check_fmt.yml
+++ b/.github/workflows/check_fmt.yml
@@ -4,9 +4,17 @@ on:
   push:
     branches:
       - master
+    paths-ignore:
+      - 'utils/**'
+      - 'doc/**'
+      - 'docker/**'
   pull_request:
     branches:
       - master
+    paths-ignore:
+      - 'utils/**'
+      - 'doc/**'
+      - 'docker/**'
 
 jobs:
   build:
@@ -22,7 +30,7 @@ jobs:
     - name: Set up Rust nightly
       run: |
           rustup self update
-          rustup toolchain install nightly
+          rustup toolchain install nightly --component rustfmt
           rustup default nightly
     - name: Make all
       run: |