diff --git a/src/V3CCtors.cpp b/src/V3CCtors.cpp
index b02e0ffb0..88821abba 100644
--- a/src/V3CCtors.cpp
+++ b/src/V3CCtors.cpp
@@ -162,10 +162,10 @@ void V3CCtors::cctorsAll() {
             }
         }
         if (v3Global.opt.coverage()) {
-            V3CCtorsVisitor configure_coverage
-                (modp, "_configure_coverage",
-                 EmitCBaseVisitor::symClassVar()+ ", bool first", "vlSymsp, first",
-                 "if (0 && vlSymsp && first) {}  // Prevent unused\n");
+            V3CCtorsVisitor configure_coverage(
+                modp, "_configure_coverage",
+                EmitCBaseVisitor::symClassVar() + ", bool first", "vlSymsp, first",
+                "if (false && vlSymsp && first) {}  // Prevent unused\n");
             for (AstNode* np = modp->stmtsp(); np; np = np->nextp()) {
                 if (AstCoverDecl* coverp = VN_CAST(np, CoverDecl)) {
                     AstNode* backp = coverp->backp();
diff --git a/src/V3EmitC.cpp b/src/V3EmitC.cpp
index e707dd4e7..2a9c1d1d2 100644
--- a/src/V3EmitC.cpp
+++ b/src/V3EmitC.cpp
@@ -2137,8 +2137,9 @@ void EmitCImp::emitCtorImp(AstNodeModule* modp) {
 void EmitCImp::emitConfigureImp(AstNodeModule* modp) {
     puts("\nvoid " + prefixNameProtect(modp) + "::" + protect("__Vconfigure") + "("
          + symClassName() + "* vlSymsp, bool first) {\n");
-    puts(   "if (0 && first) {}  // Prevent unused\n");
+    puts(   "if (false && first) {}  // Prevent unused\n");
     puts(   "this->__VlSymsp = vlSymsp;\n");  // First, as later stuff needs it.
+    puts(   "if (false && this->__VlSymsp) {}  // Prevent unused\n");
     if (v3Global.opt.coverage() ) {
         puts(protect("_configure_coverage")+"(vlSymsp, first);\n");
     }
@@ -3451,7 +3452,7 @@ class EmitCTrace : EmitCStmts {
             if (nodep->symProlog()) puts(EmitCBaseVisitor::symTopAssign()+"\n");
 
             puts("int c = code;\n");
-            puts("if (0 && vcdp && c) {}  // Prevent unused\n");
+            puts("if (false && vcdp && c) {}  // Prevent unused\n");
             if (nodep->funcType() == AstCFuncType::TRACE_INIT) {
                 puts("vcdp->module(vlSymsp->name());  // Setup signal names\n");
             } else if (nodep->funcType() == AstCFuncType::TRACE_INIT_SUB) {