diff --git a/coregrind/m_gdbserver/server.c b/coregrind/m_gdbserver/server.c
index 2f26178e7..1f3d13dfd 100644
--- a/coregrind/m_gdbserver/server.c
+++ b/coregrind/m_gdbserver/server.c
@@ -107,7 +107,7 @@ void reset_valgrind_sink(const char *info)
        && initial_valgrind_sink_saved) {
       VG_(log_output_sink).fd = initial_valgrind_sink.fd;
       VG_(umsg) ("Reset valgrind output to log (%s)\n",
-                 (info = NULL ? "" : info));
+                 (info == NULL ? "" : info));
    }
 }
 
diff --git a/lackey/lk_main.c b/lackey/lk_main.c
index 12b0034eb..707ba9722 100644
--- a/lackey/lk_main.c
+++ b/lackey/lk_main.c
@@ -1011,7 +1011,7 @@ static void lk_fini(Int exitcode)
       VG_(umsg)("Jccs:\n");
       VG_(umsg)("  total:         %'llu\n", total_Jccs);
       VG_(umsg)("  taken:         %'llu (%.0f%%)\n",
-                taken_Jccs, taken_Jccs * 100.0 / total_Jccs ?: 1);
+                taken_Jccs, taken_Jccs * 100.0 / (total_Jccs ? total_Jccs : 1));
       
       VG_(umsg)("\n");
       VG_(umsg)("Executed:\n");