diff --git a/include/verilated_fst_c.cpp b/include/verilated_fst_c.cpp
index 874e58bc3..7b8c01dc9 100644
--- a/include/verilated_fst_c.cpp
+++ b/include/verilated_fst_c.cpp
@@ -204,7 +204,7 @@ void VerilatedFst::declArray(vluint32_t code, const char* name, int dtypenum, fs
 }
 void VerilatedFst::declFloat(vluint32_t code, const char* name, int dtypenum, fstVarDir vardir,
                              fstVarType vartype, bool array, int arraynum) {
-    declare(code, name, dtypenum, vardir, vartype, array, arraynum, 31, 0);
+    declare(code, name, dtypenum, vardir, vartype, array, arraynum, 31, 0);  // LCOV_EXCL_LINE
 }
 void VerilatedFst::declDouble(vluint32_t code, const char* name, int dtypenum, fstVarDir vardir,
                               fstVarType vartype, bool array, int arraynum) {
@@ -266,7 +266,7 @@ void VerilatedFst::emitWData(vluint32_t code, const WData* newvalp, int bits) {
 
 VL_ATTR_ALWINLINE
 void VerilatedFst::emitFloat(vluint32_t code, float newval) {
-    fstWriterEmitValueChange(m_fst, m_symbolp[code], &newval);
+    fstWriterEmitValueChange(m_fst, m_symbolp[code], &newval);  // LCOV_EXCL_LINE
 }
 
 VL_ATTR_ALWINLINE
diff --git a/include/verilated_save.cpp b/include/verilated_save.cpp
index 3b6e3732b..e5df393b2 100644
--- a/include/verilated_save.cpp
+++ b/include/verilated_save.cpp
@@ -194,8 +194,8 @@ void VerilatedSave::flush() VL_MT_UNSAFE_ONE {
         ssize_t got = ::write(m_fd, wp, remaining);
         if (got > 0) {
             wp += got;
-        } else if (got < 0) {
-            if (errno != EAGAIN && errno != EINTR) {
+        } else if (VL_UNCOVERABLE(got < 0)) {
+            if (VL_UNCOVERABLE(errno != EAGAIN && errno != EINTR)) {
                 // write failed, presume error (perhaps out of disk space)
                 std::string msg = std::string(__FUNCTION__) + ": " + strerror(errno);
                 VL_FATAL_MT("", 0, "", msg.c_str());
@@ -223,8 +223,8 @@ void VerilatedRestore::fill() VL_MT_UNSAFE_ONE {
         ssize_t got = ::read(m_fd, m_endp, remaining);
         if (got > 0) {
             m_endp += got;
-        } else if (got < 0) {
-            if (errno != EAGAIN && errno != EINTR) {
+        } else if (VL_UNCOVERABLE(got < 0)) {
+            if (VL_UNCOVERABLE(errno != EAGAIN && errno != EINTR)) {
                 // write failed, presume error (perhaps out of disk space)
                 std::string msg = std::string(__FUNCTION__) + ": " + strerror(errno);
                 VL_FATAL_MT("", 0, "", msg.c_str());
diff --git a/include/verilated_vcd_sc.h b/include/verilated_vcd_sc.h
index 7b8ffa33e..dcadc8bc2 100644
--- a/include/verilated_vcd_sc.h
+++ b/include/verilated_vcd_sc.h
@@ -77,7 +77,7 @@ private:
     virtual void set_time_unit(int exponent10_seconds) {}  // deprecated
 #endif
 #if defined(NC_SYSTEMC) || (SYSTEMC_VERSION >= 20111100)
-    virtual void set_time_unit(double v, sc_time_unit tu) {}
+    virtual void set_time_unit(double v, sc_time_unit tu) {}  // LCOV_EXCL_LINE
 #endif
 
 //--------------------------------------------------