diff --git a/src/V3Coverage.cpp b/src/V3Coverage.cpp
index 657b8803f..beb384a26 100644
--- a/src/V3Coverage.cpp
+++ b/src/V3Coverage.cpp
@@ -168,6 +168,7 @@ private:
 		// Add signal to hold the old value
 		string newvarname = (string)"__Vtogcov__"+nodep->shortName();
 		AstVar* chgVarp = new AstVar (nodep->fileline(), AstVarType::MODULETEMP, newvarname, nodep);
+		chgVarp->fileline()->modifyWarnOff(V3ErrorCode::UNUSED, true);
 		m_modp->addStmtp(chgVarp);
 
 		// Create bucket for each dimension * bit.