diff --git a/.github/workflows/regress.yml b/.github/workflows/regress.yml
index 096873446..4ca9e26f8 100644
--- a/.github/workflows/regress.yml
+++ b/.github/workflows/regress.yml
@@ -50,12 +50,12 @@ jobs:
         if: runner.os == 'macOS'
         run: |
           brew install \
-	       autoconf \
-	       automake \
-	       bison \
-	       libevent \
-	       ncurses \
-	       pkg-config
+               autoconf \
+               automake \
+               bison \
+               libevent \
+               ncurses \
+               pkg-config
 
       - name: build
         run: |