diff --git a/.github/workflows/regress.yml b/.github/workflows/regress.yml
index b9fcaf6bc..46b45c6a3 100644
--- a/.github/workflows/regress.yml
+++ b/.github/workflows/regress.yml
@@ -55,12 +55,13 @@ jobs:
             bison \
             libevent \
             ncurses \
+            utf8proc \
             pkg-config
 
       - name: build
         run: |
           sh autogen.sh
-          ./configure
+          ./configure --enable-utf8proc
           make -j"$(getconf _NPROCESSORS_ONLN)"
 
       - name: test