diff --git a/src/V3Global.cpp b/src/V3Global.cpp
index 98129ae78..cb42337e4 100644
--- a/src/V3Global.cpp
+++ b/src/V3Global.cpp
@@ -27,9 +27,12 @@
 #include "V3Stats.h"
 
 //######################################################################
-// V3 Class -- top level
+// V3Global
 
-AstNetlist* V3Global::makeNetlist() { return new AstNetlist(); }
+void V3Global::boot() {
+    UASSERT(!m_rootp, "call once");
+    m_rootp = new AstNetlist();
+}
 
 void V3Global::clear() {
 #ifdef VL_LEAK_CHECK
diff --git a/src/V3Global.h b/src/V3Global.h
index 84a75d7e2..a7b54e866 100644
--- a/src/V3Global.h
+++ b/src/V3Global.h
@@ -119,11 +119,7 @@ public:
 
     // CONSTRUCTORS
     V3Global() {}
-    AstNetlist* makeNetlist();
-    void boot() {
-        UASSERT(!m_rootp, "call once");
-        m_rootp = makeNetlist();
-    }
+    void boot();
     void clear();
     void shutdown();  // Release allocated resorces
     // ACCESSORS (general)
diff --git a/src/V3PreShell.cpp b/src/V3PreShell.cpp
index 6d64c4b7f..4b817a53b 100644
--- a/src/V3PreShell.cpp
+++ b/src/V3PreShell.cpp
@@ -49,9 +49,8 @@ protected:
         return level;
     }
 
-    void boot(char** env) {
+    void boot() {
         // Create the implementation pointer
-        if (env) {}
         if (!s_preprocp) {
             FileLine* const cmdfl = new FileLine(FileLine::commandLineFilename());
             s_preprocp = V3PreProc::createPreProc(cmdfl);
@@ -162,7 +161,7 @@ VInFilter* V3PreShellImp::s_filterp = nullptr;
 //######################################################################
 // V3PreShell
 
-void V3PreShell::boot(char** env) { V3PreShellImp::s_preImp.boot(env); }
+void V3PreShell::boot() { V3PreShellImp::s_preImp.boot(); }
 bool V3PreShell::preproc(FileLine* fl, const string& modname, VInFilter* filterp,
                          V3ParseImp* parsep, const string& errmsg) {
     return V3PreShellImp::s_preImp.preproc(fl, modname, filterp, parsep, errmsg);
diff --git a/src/V3PreShell.h b/src/V3PreShell.h
index 7e26f940f..9c7b73499 100644
--- a/src/V3PreShell.h
+++ b/src/V3PreShell.h
@@ -32,7 +32,7 @@ class VSpellCheck;
 class V3PreShell final {
     // Static class for calling preprocessor
 public:
-    static void boot(char** env);
+    static void boot();
     static bool preproc(FileLine* fl, const string& modname, VInFilter* filterp,
                         V3ParseImp* parsep, const string& errmsg);
     static void preprocInclude(FileLine* fl, const string& modname);
diff --git a/src/Verilator.cpp b/src/Verilator.cpp
index 97e3393c4..f503ee6b9 100644
--- a/src/Verilator.cpp
+++ b/src/Verilator.cpp
@@ -716,7 +716,7 @@ int main(int argc, char** argv, char** env) {
 
     // Preprocessor
     // Before command parsing so we can handle -Ds on command line.
-    V3PreShell::boot(env);
+    V3PreShell::boot();
 
     // Command option parsing
     v3Global.opt.bin(argv[0]);