diff --git a/phosphor-regulators/src/journal.cpp b/phosphor-regulators/src/journal.cpp
index eed5a70..955792a 100644
--- a/phosphor-regulators/src/journal.cpp
+++ b/phosphor-regulators/src/journal.cpp
@@ -43,7 +43,7 @@
     JournalCloser& operator=(const JournalCloser&) = delete;
     JournalCloser& operator=(JournalCloser&&) = delete;
 
-    JournalCloser(sd_journal* journal) : journal{journal}
+    explicit JournalCloser(sd_journal* journal) : journal{journal}
     {}
 
     ~JournalCloser()