diff --git a/bio/clustalo/environment.yaml b/bio/clustalo/environment.yaml
index a175ee2561..fb35b22979 100644
--- a/bio/clustalo/environment.yaml
+++ b/bio/clustalo/environment.yaml
@@ -3,4 +3,4 @@ channels:
   - bioconda
   - nodefaults
 dependencies:
-  - clustalo ==1.2.4
+  - clustalo =1.2.4