diff --git a/src/job.c b/src/job.c
index 887de92cad..9937ed735b 100644
--- a/src/job.c
+++ b/src/job.c
@@ -144,11 +144,12 @@ void job_dependency_delete(Job *subject, Job *object, bool *matters) {
 }
 
 void job_dump(Job *j, FILE*f, const char *prefix) {
-
-
         assert(j);
         assert(f);
 
+        if (!prefix)
+                prefix = "";
+
         fprintf(f,
                 "%s-> Job %u:\n"
                 "%s\tAction: %s -> %s\n"