diff --git a/include/verilated_types.h b/include/verilated_types.h
index 80553e039..efc45588f 100644
--- a/include/verilated_types.h
+++ b/include/verilated_types.h
@@ -130,7 +130,7 @@ public:
     VlProcess()
         : m_state{RUNNING} {}
     // Construct child process of parent
-    VlProcess(VlProcessRef parentp)
+    explicit VlProcess(VlProcessRef parentp)
         : m_state{RUNNING}
         , m_parentp{parentp} {
         m_parentp->attach(this);
diff --git a/src/V3Ast.h b/src/V3Ast.h
index 18c92b0b0..874ca74c3 100644
--- a/src/V3Ast.h
+++ b/src/V3Ast.h
@@ -1472,10 +1472,10 @@ class VSelfPointerText final {
 public:
     // CONSTRUCTORS
     class Empty {};  // for creator type-overload selection
-    VSelfPointerText(Empty)
+    explicit VSelfPointerText(Empty)
         : m_strp{s_emptyp} {}
     class This {};  // for creator type-overload selection
-    VSelfPointerText(This)
+    explicit VSelfPointerText(This)
         : m_strp{s_thisp} {}
     VSelfPointerText(This, const string& field)
         : m_strp{std::make_shared<const string>("this->" + field)} {}
diff --git a/src/V3AstNodeOther.h b/src/V3AstNodeOther.h
index e564f3295..527d78771 100644
--- a/src/V3AstNodeOther.h
+++ b/src/V3AstNodeOther.h
@@ -3287,7 +3287,7 @@ public:
 };
 class AstTracePopPrefix final : public AstNodeStmt {
 public:
-    AstTracePopPrefix(FileLine* fl)
+    explicit AstTracePopPrefix(FileLine* fl)
         : ASTGEN_SUPER_TracePopPrefix(fl) {}
     ASTGEN_MEMBERS_AstTracePopPrefix;
     bool same(const AstNode* samep) const override { return false; }
diff --git a/src/V3Sched.cpp b/src/V3Sched.cpp
index 0d1781729..6e43d3a08 100644
--- a/src/V3Sched.cpp
+++ b/src/V3Sched.cpp
@@ -1288,8 +1288,8 @@ void schedule(AstNetlist* netlistp) {
             if (it != actTimingDomains.end()) out = it->second;
             if (vscp->varp()->isWrittenByDpi()) out.push_back(dpiExportTriggeredAct);
             if (vscp->varp()->sensIfacep()) {
-                const auto it = vifTriggeredAct.find(vscp->varp()->sensIfacep());
-                if (it != vifTriggeredAct.end()) out.push_back(it->second);
+                const auto sit = vifTriggeredAct.find(vscp->varp()->sensIfacep());
+                if (sit != vifTriggeredAct.end()) out.push_back(sit->second);
             }
         });
     splitCheck(actFuncp);
@@ -1325,8 +1325,8 @@ void schedule(AstNetlist* netlistp) {
                 if (it != timingDomains.end()) out = it->second;
                 if (vscp->varp()->isWrittenByDpi()) out.push_back(dpiExportTriggered);
                 if (vscp->varp()->sensIfacep()) {
-                    const auto it = vifTriggered.find(vscp->varp()->sensIfacep());
-                    if (it != vifTriggered.end()) out.push_back(it->second);
+                    const auto sit = vifTriggered.find(vscp->varp()->sensIfacep());
+                    if (sit != vifTriggered.end()) out.push_back(sit->second);
                 }
             });