diff --git a/src/osgPlugins/3ds/readwrite.cpp b/src/osgPlugins/3ds/readwrite.cpp
index e2b236522..139d3af66 100644
--- a/src/osgPlugins/3ds/readwrite.cpp
+++ b/src/osgPlugins/3ds/readwrite.cpp
@@ -276,7 +276,7 @@ lib3ds_string_read(char *s, int buflen, FILE *f)
 {
   int k=0;
   ASSERT(f);
-  while ((*s++=fgetc(f))!=0) {
+  while ((*s++=char(fgetc(f)))!=0) {
     if (++k>=buflen) {
       return(LIB3DS_FALSE);
     }
@@ -325,8 +325,8 @@ lib3ds_word_write(Lib3dsWord w, FILE *f)
   Lib3dsByte b[2];
 
   ASSERT(f);
-  b[1]=((Lib3dsWord)w & 0xFF00) >> 8;
-  b[0]=((Lib3dsWord)w & 0x00FF);
+  b[1]=(Lib3dsByte)(((Lib3dsWord)w & 0xFF00) >> 8);
+  b[0]=(Lib3dsByte)((Lib3dsWord)w & 0x00FF);
   if (fwrite(b,2,1,f)!=1) {
     return(LIB3DS_FALSE);
   }
@@ -398,8 +398,8 @@ lib3ds_intw_write(Lib3dsIntw w, FILE *f)
   Lib3dsByte b[2];
 
   ASSERT(f);
-  b[1]=((Lib3dsWord)w & 0xFF00) >> 8;
-  b[0]=((Lib3dsWord)w & 0x00FF);
+  b[1]=(Lib3dsByte)(((Lib3dsWord)w & 0xFF00) >> 8);
+  b[0]=(Lib3dsByte)((Lib3dsWord)w & 0x00FF);
   if (fwrite(b,2,1,f)!=1) {
     return(LIB3DS_FALSE);
   }
diff --git a/src/osgPlugins/bsp/BITSET.cpp b/src/osgPlugins/bsp/BITSET.cpp
index 29a1a194d..6898e666c 100644
--- a/src/osgPlugins/bsp/BITSET.cpp
+++ b/src/osgPlugins/bsp/BITSET.cpp
@@ -49,5 +49,5 @@ void BITSET::Set(int bitNumber)
 
 unsigned char BITSET::IsSet(int bitNumber) const
 {
-  return m_bits_aux[bitNumber>>3] & 1<<(bitNumber&7);
+  return static_cast<unsigned char>(m_bits_aux[bitNumber>>3] & 1<<(bitNumber&7));
 }