diff --git a/Changes b/Changes
index ed2c6e4f2..e58c002b6 100644
--- a/Changes
+++ b/Changes
@@ -85,6 +85,7 @@ Verilator 5.029 devel
 * Fix configure inserting absolute paths for Python and Perl (#5504) (#5505). [Nathan Graybeal]
 * Fix pattern initialization with typedef key (#5512). [Eugene Feinberg]
 * Fix `-j` option without argument in hierarchical Verilation (#5514). [Ryszard Rozak, Antmicro Ltd.]
+* Fix long module names crashing string handling (#5546). [Filip Badáň]
 
 
 Verilator 5.028 2024-08-21
diff --git a/include/verilated.cpp b/include/verilated.cpp
index 612e76a78..9bb99166c 100644
--- a/include/verilated.cpp
+++ b/include/verilated.cpp
@@ -1765,9 +1765,8 @@ IData VL_SYSTEM_IQ(QData lhs) VL_MT_SAFE {
     return VL_SYSTEM_IW(VL_WQ_WORDS_E, lhsw);
 }
 IData VL_SYSTEM_IW(int lhswords, const WDataInP lhsp) VL_MT_SAFE {
-    char filenamez[VL_VALUE_STRING_MAX_CHARS + 1];
-    _vl_vint_to_string(lhswords * VL_EDATASIZE, filenamez, lhsp);
-    return VL_SYSTEM_IN(filenamez);
+    const std::string lhs = VL_CVT_PACK_STR_NW(lhswords, lhsp);
+    return VL_SYSTEM_IN(lhs);
 }
 IData VL_SYSTEM_IN(const std::string& lhs) VL_MT_SAFE {
     const int code = std::system(lhs.c_str());  // Yes, std::system() is threadsafe
@@ -1917,20 +1916,16 @@ std::string VL_TOUPPER_NN(const std::string& ld) VL_PURE {
 
 std::string VL_CVT_PACK_STR_NW(int lwords, const WDataInP lwp) VL_PURE {
     // See also _vl_vint_to_string
-    char destout[VL_VALUE_STRING_MAX_CHARS + 1];
+    std::string result;
+    result.reserve((lwords * VL_EDATASIZE) / 8 + 1);
     const int obits = lwords * VL_EDATASIZE;
     int lsb = obits - 1;
-    char* destp = destout;
-    size_t len = 0;
     for (; lsb >= 0; --lsb) {
         lsb = (lsb / 8) * 8;  // Next digit
         const IData charval = VL_BITRSHIFT_W(lwp, lsb) & 0xff;
-        if (charval) {
-            *destp++ = static_cast<char>(charval);
-            ++len;
-        }
+        if (charval) result += static_cast<char>(charval);
     }
-    return std::string{destout, len};
+    return result;
 }
 
 std::string VL_CVT_PACK_STR_ND(const VlQueue<std::string>& q) VL_PURE {
diff --git a/include/verilatedos.h b/include/verilatedos.h
index 93c907269..6cb83732f 100644
--- a/include/verilatedos.h
+++ b/include/verilatedos.h
@@ -468,8 +468,6 @@ using ssize_t = uint32_t;  ///< signed size_t; returned from read()
     #define VL_VALUE_STRING_MAX_WORDS 64  ///< Max size in words of String conversion operation
 #endif
 
-#define VL_VALUE_STRING_MAX_CHARS (VL_VALUE_STRING_MAX_WORDS * VL_EDATASIZE / VL_BYTESIZE)
-
 //=========================================================================
 // Base macros