diff --git a/src/util/debug.cpp b/src/util/debug.cpp
index 54c67fe..66676c6 100644
--- a/src/util/debug.cpp
+++ b/src/util/debug.cpp
@@ -78,3 +78,3 @@ void invoke_gdb() {
         char result;
-        bool ok = (std::cin >> result);
+        bool ok = bool(std::cin >> result);
         if (!ok) exit(ERR_INTERNAL_FATAL); // happens if std::cin is eof or unattached.
diff --git a/src/util/mpz.cpp b/src/util/mpz.cpp
index 8559279..7dca14b 100644
--- a/src/util/mpz.cpp
+++ b/src/util/mpz.cpp
@@ -136,3 +136,3 @@ mpz_manager<SYNCH>::mpz_manager():
     mpz one(1);
-    set(m_two64, UINT64_MAX);
+    set(m_two64, (uint64)UINT64_MAX);
     add(m_two64, one, m_two64);