diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8086cc9..89cb7a2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -86,5 +86,5 @@ jobs:
               readline
           run: |
             ./bootstrap
-            CFLAGS="-I/usr/local/include -L/usr/local/lib" ./configure
+            CFLAGS="-I/usr/local/include -L/usr/local/lib -DLIBICONV_PLUG" ./configure
             make -j $(nproc)