diff --git a/include/nlohmann/detail/input/binary_reader.hpp b/include/nlohmann/detail/input/binary_reader.hpp
index 655c30f21..1e3f565ee 100644
--- a/include/nlohmann/detail/input/binary_reader.hpp
+++ b/include/nlohmann/detail/input/binary_reader.hpp
@@ -2402,7 +2402,7 @@ class binary_reader
             case 0xB5:
             case 0xB6:
             case 0xB7:
-                return sax->number_unsigned(current - 0x90);
+                return sax->number_unsigned(static_cast<number_unsigned_t>(current) - static_cast<number_unsigned_t>(0x90));
 
             case 0xB8:
             case 0xB9:
@@ -2414,7 +2414,7 @@ class binary_reader
             case 0xBF:
             case 0xC0:
             case 0xC1:
-                return sax->number_integer(0xB7 - current);
+                return sax->number_integer(static_cast<number_integer_t>(0xB7) - static_cast<number_integer_t>(current));
 
             case 0xF8:
                 return sax->boolean(false);
diff --git a/single_include/nlohmann/json.hpp b/single_include/nlohmann/json.hpp
index af4c3caa0..610206761 100644
--- a/single_include/nlohmann/json.hpp
+++ b/single_include/nlohmann/json.hpp
@@ -10696,7 +10696,7 @@ class binary_reader
             case 0xB5:
             case 0xB6:
             case 0xB7:
-                return sax->number_unsigned(current - 0x90);
+                return sax->number_unsigned(static_cast<number_unsigned_t>(current) - static_cast<number_unsigned_t>(0x90));
 
             case 0xB8:
             case 0xB9:
@@ -10708,7 +10708,7 @@ class binary_reader
             case 0xBF:
             case 0xC0:
             case 0xC1:
-                return sax->number_integer(0xB7 - current);
+                return sax->number_integer(static_cast<number_integer_t>(0xB7) - static_cast<number_integer_t>(current));
 
             case 0xF8:
                 return sax->boolean(false);