diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index fb80ed026..6f716c7e7 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -219,7 +219,7 @@ steps:
   displayName: 'Building mac full build'
 
 - bash: |
-    sudo apt -qq -y install libfl-dev
+    sudo apt -qq -y install flex
     export GCCVER=gcc1220
     cd sys/unix
     sh setup.sh hints/linux.370