diff --git a/include/verilated.cpp b/include/verilated.cpp
index 17ee99aa9..c975b76e0 100644
--- a/include/verilated.cpp
+++ b/include/verilated.cpp
@@ -2453,7 +2453,7 @@ void VerilatedContext::timeprecision(int value) VL_MT_SAFE {
             sc_prec = 15;
         }
     }
-    if (value != sc_prec) {
+    if (VL_UNLIKELY(value != sc_prec)) {
         std::ostringstream msg;
         msg << "SystemC's sc_set_time_resolution is 10^-" << sc_prec
             << ", which does not match Verilog timeprecision 10^-" << value
@@ -2524,7 +2524,7 @@ void VerilatedContext::internalsDump() const VL_MT_SAFE {
 void VerilatedContext::addModel(VerilatedModel* modelp) {
     threadPoolp();  // Ensure thread pool is created, so m_threads cannot change any more
 
-    if (modelp->threads() > m_threads) {
+    if (VL_UNLIKELY(modelp->threads() > m_threads)) {
         std::ostringstream msg;
         msg << "VerilatedContext has " << m_threads << " threads but model '"
             << modelp->modelName() << "' (instantiated as '" << modelp->hierName()
diff --git a/include/verilated_fst_sc.cpp b/include/verilated_fst_sc.cpp
index f6bfeb41a..b093e1eac 100644
--- a/include/verilated_fst_sc.cpp
+++ b/include/verilated_fst_sc.cpp
@@ -29,7 +29,7 @@
 //======================================================================
 
 void VerilatedFstSc::open(const char* filename) {
-    if (!sc_core::sc_get_curr_simcontext()->elaboration_done()) {
+    if (VL_UNLIKELY(!sc_core::sc_get_curr_simcontext()->elaboration_done())) {
         vl_fatal(__FILE__, __LINE__, "VerilatedFstSc",
                  ("%Error: VerilatedFstSc::open(\"" + std::string{filename}
                   + "\") is called before sc_core::sc_start(). "
diff --git a/include/verilated_vcd_sc.cpp b/include/verilated_vcd_sc.cpp
index a7286d050..2da4de7b1 100644
--- a/include/verilated_vcd_sc.cpp
+++ b/include/verilated_vcd_sc.cpp
@@ -29,7 +29,7 @@
 //======================================================================
 
 void VerilatedVcdSc::open(const char* filename) {
-    if (!sc_core::sc_get_curr_simcontext()->elaboration_done()) {
+    if (VL_UNLIKELY(!sc_core::sc_get_curr_simcontext()->elaboration_done())) {
         vl_fatal(__FILE__, __LINE__, "VerilatedVcdSc",
                  ("%Error: VerilatedVcdSc::open(\"" + std::string{filename}
                   + "\") is called before sc_core::sc_start(). "