diff --git a/Changes b/Changes
index e5f0e02b2..af190d398 100644
--- a/Changes
+++ b/Changes
@@ -17,6 +17,7 @@ Verilator 5.021 devel
 * Remove deprecated 32-bit pointer mode (`gcc -m32`).
 * Fix delays using wrong timeunits when modules inlined (#4806). [Paul Wright]
 * Fix lint_off disables on preprocessor warnings (#4703). [Srinivasan Venkataramanan]
+* Fix mis-splitting of dump control functions (#4821). [Fan Shupei]
 
 
 Verilator 5.020 2024-01-01
diff --git a/src/V3AstNodeExpr.h b/src/V3AstNodeExpr.h
index 89caeed1e..a7b1a6775 100644
--- a/src/V3AstNodeExpr.h
+++ b/src/V3AstNodeExpr.h
@@ -2072,6 +2072,7 @@ public:
     string emitC() override { return "VL_VALUEPLUSARGS_%nq(%lw, %P, nullptr)"; }
     bool isGateOptimizable() const override { return false; }
     bool isPredictOptimizable() const override { return false; }
+    // but isPure() true
     bool cleanOut() const override { return true; }
     bool same(const AstNode* /*samep*/) const override { return true; }
 };
@@ -3479,6 +3480,7 @@ public:
     bool sizeMattersRhs() const override { return false; }
     bool isGateOptimizable() const override { return false; }
     bool isPredictOptimizable() const override { return false; }
+    bool isPure() override { return false; }
     int instrCount() const override { return INSTR_COUNT_PLI; }
 };
 
diff --git a/src/V3AstNodeOther.h b/src/V3AstNodeOther.h
index ee2b52808..2ca075540 100644
--- a/src/V3AstNodeOther.h
+++ b/src/V3AstNodeOther.h
@@ -2840,8 +2840,9 @@ public:
     ASTGEN_MEMBERS_AstDumpCtl;
     string verilogKwd() const override { return ctlType().ascii(); }
     bool isGateOptimizable() const override { return false; }
-    bool isPredictOptimizable() const override { return false; }
     bool isOutputter() override { return true; }
+    bool isPredictOptimizable() const override { return false; }
+    bool isPure() override { return false; }
     virtual bool cleanOut() const { return true; }
     bool same(const AstNode* /*samep*/) const override { return true; }
     VDumpCtlType ctlType() const { return m_ctlType; }