diff --git a/src/main/groovy/com/github/spotbugs/snom/internal/SpotBugsRunnerForHybrid.java b/src/main/groovy/com/github/spotbugs/snom/internal/SpotBugsRunnerForHybrid.java
index 022d30e8..27956b4d 100644
--- a/src/main/groovy/com/github/spotbugs/snom/internal/SpotBugsRunnerForHybrid.java
+++ b/src/main/groovy/com/github/spotbugs/snom/internal/SpotBugsRunnerForHybrid.java
@@ -155,7 +155,7 @@ public void execute() {
               .map(URI::toString)
               .collect(Collectors.toList());
       if (!reportPaths.isEmpty()) {
-        errorMessage += " See the report at: " + String.join(",", reportPaths);
+        errorMessage += " See the report at: " + String.join(", ", reportPaths);
       }
       throw new GradleException(errorMessage);
     }