diff --git a/luprex/core/cpp/pprint.cpp b/luprex/core/cpp/pprint.cpp
index f4d18915..f5efe242 100644
--- a/luprex/core/cpp/pprint.cpp
+++ b/luprex/core/cpp/pprint.cpp
@@ -14,9 +14,16 @@ void atomic_print(LuaStack &LS, LuaSlot val, std::ostream *os) {
         // TODO: this could be more efficient.
         (*os) << LS.ckstring(val);
         return;
-    case LUA_TNUMBER:
-        (*os) << LS.ckinteger(val);
+    case LUA_TNUMBER: {
+        double value = LS.cknumber(val);
+        int64_t ivalue = int64_t(value);
+        if (double(ivalue) == value) {
+            (*os) << ivalue;
+        } else {
+            (*os) << value;
+        }
         return;
+    }
     case LUA_TBOOLEAN:
         (*os) << (LS.ckboolean(val) ? "true" : "false");
         return;