diff --git a/src/extra-tools/execl-envfile.c b/src/extra-tools/execl-envfile.c
index 6555d219ec8c9dda4faeaa658c3046dbbbb59d56..53010574084033dfbb7a7555f0fb194e9be34c20 100644
--- a/src/extra-tools/execl-envfile.c
+++ b/src/extra-tools/execl-envfile.c
@@ -356,7 +356,7 @@ int main (int argc, char const *const *argv, char const *const *envp)
             unexport = 0 ;
             sa.len = 0 ;
 
-            if (!auto_stra(&sa, tmp))
+            if (!stralloc_copyb(&sa, tmp, tmplen))
                 log_die_nomem("stralloc") ;
 
             if (!environ_get_key_nclean(&sa, &pos))