diff --git a/src/bootctl/bootctl-install.c b/src/bootctl/bootctl-install.c
index 816a4c8ac0..2099f42ae8 100644
--- a/src/bootctl/bootctl-install.c
+++ b/src/bootctl/bootctl-install.c
@@ -218,7 +218,7 @@ static int version_check(int fd_from, const char *from, int fd_to, const char *t
                                         "Skipping \"%s\", it's owned by another boot loader.", to);
 
         r = compare_version(a, b);
-        log_debug("Comparing versions: \"%s\" %s \"%s", a, comparison_operator(r), b);
+        log_debug("Comparing versions: \"%s\" %s \"%s\"", a, comparison_operator(r), b);
         if (r < 0)
                 return log_warning_errno(SYNTHETIC_ERRNO(ESTALE),
                                          "Skipping \"%s\", newer boot loader version in place already.", to);