diff --git a/include/bitsery/details/adapter_common.h b/include/bitsery/details/adapter_common.h
index 2297840..153631b 100644
--- a/include/bitsery/details/adapter_common.h
+++ b/include/bitsery/details/adapter_common.h
@@ -125,7 +125,7 @@ namespace bitsery {
             }
 
             static uint16_t exec(uint16_t value) {
-                return (value & 0x00ff) << 8 | (value & 0xff00) >> 8;
+                return static_cast<uint16_t>((value & 0x00ff) << 8 | (value & 0xff00) >> 8);
             }
 
             static uint8_t exec(uint8_t value) {
diff --git a/include/bitsery/traits/core/std_defaults.h b/include/bitsery/traits/core/std_defaults.h
index dade1f4..b6111b1 100644
--- a/include/bitsery/traits/core/std_defaults.h
+++ b/include/bitsery/traits/core/std_defaults.h
@@ -85,7 +85,7 @@ namespace bitsery {
             static void increaseBufferSize(T& container) {
                 //since we're writing to buffer use different resize strategy than default implementation
                 //when small size grow faster, to avoid thouse 2/4/8/16... byte allocations
-                auto newSize = static_cast<size_t>(container.size() * 1.5 + 128);
+                auto newSize = static_cast<size_t>(static_cast<double>(container.size()) * 1.5) + 128;
                 //make data cache friendly
                 newSize -= newSize % 64;//64 is cache line size
                 container.resize((std::max)(newSize, container.capacity()));