diff --git a/modules/lm-coursier/src/main/scala/lmcoursier/FromSbt.scala b/modules/lm-coursier/src/main/scala/lmcoursier/FromSbt.scala
index 088666e65..2e3c7bbeb 100644
--- a/modules/lm-coursier/src/main/scala/lmcoursier/FromSbt.scala
+++ b/modules/lm-coursier/src/main/scala/lmcoursier/FromSbt.scala
@@ -102,8 +102,8 @@ object FromSbt {
           }
 
     for {
-      (from, to) <- allMappings
-      pub <- publications
+      (from, to) <- allMappings.distinct
+      pub <- publications.distinct
     } yield {
       val dep0 = dep
         .withConfiguration(to)