diff --git a/src/types.cpp b/src/types.cpp
index f3b740bf..2a5844bd 100644
--- a/src/types.cpp
+++ b/src/types.cpp
@@ -237,6 +237,9 @@ namespace Exiv2 {
 
     float getFloat(const byte* buf, ByteOrder byteOrder)
     {
+        // This algorithm assumes that the internal representation of the float
+        // type is the 4-byte IEEE 754 binary32 format, which is common but not
+        // required by the C++ standard.
         assert(sizeof(float) == 4);
         uint32_t ul = getULong(buf, byteOrder);
         return *reinterpret_cast<float*>(&ul);
@@ -318,6 +321,9 @@ namespace Exiv2 {
 
     long f2Data(byte* buf, float f, ByteOrder byteOrder)
     {
+        // This algorithm assumes that the internal representation of the float
+        // type is the 4-byte IEEE 754 binary32 format, which is common but not
+        // required by the C++ standard.
         assert(sizeof(float) == 4);
         uint32_t ul = *reinterpret_cast<uint32_t*>(&f);
         return ul2Data(buf, ul, byteOrder);
diff --git a/src/value.hpp b/src/value.hpp
index e8d1248e..66f19cbc 100644
--- a/src/value.hpp
+++ b/src/value.hpp
@@ -1597,7 +1597,7 @@ namespace Exiv2 {
     long ValueType<T>::toLong(long n) const
     {
         ok_ = true;
-        return value_[n];
+        return static_cast<long>(value_[n]);
     }
     // Specialization for rational
     template<>