diff --git a/vvp/vvp_net.cc b/vvp/vvp_net.cc
index 277732560..a8c669e26 100644
--- a/vvp/vvp_net.cc
+++ b/vvp/vvp_net.cc
@@ -416,14 +416,14 @@ vvp_vector4_t::vvp_vector4_t(unsigned size, double val)
 
 	/* Skip any leading bits. */
       for (int idx = (signed) nwords; idx > (signed) my_words; idx -=1) {
-	    unsigned bits = (unsigned) fraction;
+	    unsigned long bits = (unsigned long) fraction;
 	    fraction = fraction - (double) bits;
 	    fraction = ldexp(fraction, BITS_PER_WORD);
       }
 
 	/* Convert the remaining bits as appropriate. */
       if (my_words == 0) {
-		  unsigned bits = (unsigned) fraction;
+		  unsigned long bits = (unsigned long) fraction;
 		  abits_val_ = bits;
 		  fraction = fraction - (double) bits;
 		    /* Round any fractional part up. */
@@ -431,7 +431,7 @@ vvp_vector4_t::vvp_vector4_t(unsigned size, double val)
       } else {
 	    if (nwords < my_words) my_words = nwords;
 	    for (int idx = (signed)my_words; idx >= 0; idx -= 1) {
-		  unsigned bits = (unsigned) fraction;
+		  unsigned long bits = (unsigned long) fraction;
 		  abits_ptr_[idx] = bits;
 		  fraction = fraction - (double) bits;
 		  fraction = ldexp(fraction, BITS_PER_WORD);