diff --git a/src/boot/measure.c b/src/boot/measure.c
index b9cd2853b6..913cf18ee6 100644
--- a/src/boot/measure.c
+++ b/src/boot/measure.c
@@ -898,7 +898,7 @@ static int verb_sign(int argc, char *argv[], void *userdata) {
                         }
 
                         _cleanup_free_ void *sig = malloc(ss);
-                        if (!ss) {
+                        if (!sig) {
                                 r = log_oom();
                                 goto finish;
                         }