diff --git a/tgt-vvp/vvp_scope.c b/tgt-vvp/vvp_scope.c
index 4bb7ecd91..8fbe614ad 100644
--- a/tgt-vvp/vvp_scope.c
+++ b/tgt-vvp/vvp_scope.c
@@ -1736,7 +1736,7 @@ static void draw_lpm_add(ivl_lpm_t net)
 		  type = "pow.s";
 		  if (width > 8*sizeof(long)) {
 			fprintf(stderr, "%s:%u: sorry (vvp-tgt): Signed power "
-				"result must be no more than %d bits.\n",
+				"result must be no more than %zu bits.\n",
 				ivl_lpm_file(net), ivl_lpm_lineno(net),
 				8*sizeof(long));
 			exit(1);
diff --git a/vvp/arith.cc b/vvp/arith.cc
index 7ee51a451..0fd3041e4 100644
--- a/vvp/arith.cc
+++ b/vvp/arith.cc
@@ -781,6 +781,8 @@ void vvp_shiftr::recv_vec4(vvp_net_ptr_t ptr, const vvp_vector4_t&bit)
 
 vvp_arith_real_::vvp_arith_real_()
 {
+      op_a_ = 0.0;
+      op_b_ = 0.0;
 }
 
 void vvp_arith_real_::dispatch_operand_(vvp_net_ptr_t ptr, double bit)
diff --git a/vvp/compile.cc b/vvp/compile.cc
index c826f5910..1028d0ce8 100644
--- a/vvp/compile.cc
+++ b/vvp/compile.cc
@@ -921,7 +921,7 @@ void compile_arith_div(char*label, long wid, bool signed_flag,
       assert( wid > 0 );
 
       if (argc != 2) {
-	    char *suffix = "";
+	    const char *suffix = "";
 	    if (signed_flag) suffix = ".s";
 	    fprintf(stderr, "%s; .arith/div%s has wrong number of "
 	                    "symbols\n", label, suffix);
@@ -1012,7 +1012,7 @@ void compile_arith_pow(char*label, long wid, bool signed_flag,
       }
 
       if (argc != 2) {
-	    char *suffix = "";
+	    const char *suffix = "";
 	    if (signed_flag) suffix = ".s";
 	    fprintf(stderr, "%s .arith/pow%s has wrong number of "
 	                    "symbols\n", label, suffix);
diff --git a/vvp/delay.cc b/vvp/delay.cc
index 078f409d2..85ed4d5ce 100644
--- a/vvp/delay.cc
+++ b/vvp/delay.cc
@@ -131,6 +131,7 @@ vvp_fun_delay::vvp_fun_delay(vvp_net_t*n, vvp_bit4_t init, const vvp_delay_t&d)
 : net_(n), delay_(d), cur_vec4_(1)
 {
       cur_vec4_.set_bit(0, init);
+      cur_real_ = 0.0;
       list_ = 0;
       initial_ = true;
 }
diff --git a/vvp/vvp_net.cc b/vvp/vvp_net.cc
index 8f54bf05f..cd989b1de 100644
--- a/vvp/vvp_net.cc
+++ b/vvp/vvp_net.cc
@@ -1964,6 +1964,7 @@ vvp_scalar_t vvp_fun_signal8::scalar_value(unsigned idx) const
 
 vvp_fun_signal_real::vvp_fun_signal_real()
 {
+      bits_ = 0.0;
 }
 
 double vvp_fun_signal_real::real_value() const