diff --git a/include/rapidjson/internal/strtod.h b/include/rapidjson/internal/strtod.h
index fd4b01e..289c413 100644
--- a/include/rapidjson/internal/strtod.h
+++ b/include/rapidjson/internal/strtod.h
@@ -142,7 +142,7 @@ inline bool StrtodDiyFp(const char* decimals, size_t length, size_t decimalPosit
     size_t remaining = length - i;
     const unsigned kUlpShift = 3;
     const unsigned kUlp = 1 << kUlpShift;
-    int error = (remaining == 0) ? 0 : kUlp / 2;
+    int64_t error = (remaining == 0) ? 0 : kUlp / 2;
 
     DiyFp v(significand, 0);
     v = v.Normalize();