diff --git a/main.fmf b/main.fmf
index da33613..243b6cf 100644
--- a/main.fmf
+++ b/main.fmf
@@ -17,7 +17,7 @@ adjust:
     when: distro < fedora-42
   - environment:
       DEFAULT_JAVA: 17
-    when: distro = centos-stream-9 or distro = rhel-9
+    when: distro == centos-stream-9 or distro == rhel-9
   - environment:
       DEFAULT_JAVA: 21
-    when: distro = centos-stream-10 or distro = rhel-10
+    when: distro == centos-stream-10 or distro == rhel-10