Fixed an incorrect cast introduced in an earlier commit.

code/BlenderLoader.cpp

@@ -59,6 +59,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include "StreamReader.h"
 #include "MemoryIOWrapper.h"
 #include <cctype>
+#include <cstdint>
 
 
 // zlib is needed for compressed blend files
@@ -421,7 +422,7 @@ void BlenderImporter::ResolveImage(aiMaterial* out, const Material* mat, const M
     // check if the file contents are bundled with the BLEND file
     if (img->packedfile) {
         name.data[0] = '*';
-        name.length = 1+ ASSIMP_itoa10(name.data+1,static_cast<unsigned int>(MAXLEN-1), static_cast<unsigned int>(conv_data.textures->size()));
+        name.length = 1+ ASSIMP_itoa10(name.data+1,static_cast<unsigned int>(MAXLEN-1), static_cast<int32_t>(conv_data.textures->size()));
 
         conv_data.textures->push_back(new aiTexture());
         aiTexture* tex = conv_data.textures->back();