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-rw-r--r--src/libutil/util.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libutil/util.cc b/src/libutil/util.cc
index e67568b1a78d..b1231e45574f 100644
--- a/src/libutil/util.cc
+++ b/src/libutil/util.cc
@@ -790,6 +790,7 @@ void Pid::kill()
 
 int Pid::wait(bool block)
 {
+    assert(pid != -1);
     while (1) {
         int status;
         int res = waitpid(pid, &status, block ? 0 : WNOHANG);