diff --git a/src/dmd/frontend.d b/src/dmd/frontend.d
index 2bfc3d0d9fa0..58eea3bdbc01 100644
--- a/src/dmd/frontend.d
+++ b/src/dmd/frontend.d
@@ -27,6 +27,7 @@ This needs to be done $(I before) calling any function.
 */
 void initDMD()
 {
+    import std.concurrency : initOnce;
     import dmd.builtin : builtin_init;
     import dmd.dmodule : Module;
     import dmd.expression : Expression;
@@ -37,16 +38,21 @@ void initDMD()
     import dmd.objc : Objc;
     import dmd.target : Target;
 
-    global._init();
-    addDefaultVersionIdentifiers();
-
-    Type._init();
-    Id.initialize();
-    Module._init();
-    Target._init();
-    Expression._init();
-    Objc._init();
-    builtin_init();
+    static shared bool initialized;
+    initOnce!initialized((){
+        global._init();
+        addDefaultVersionIdentifiers();
+
+        Type._init();
+        Id.initialize();
+        Module._init();
+        Target._init();
+        Expression._init();
+        Objc._init();
+        builtin_init();
+
+        return true;
+    }());
 }
 
 /**
@@ -60,6 +66,8 @@ void addImport(string path)
     import dmd.arraytypes : Strings;
     import std.string : toStringz;
 
+    initDMD;
+
     if (global.path is null)
         global.path = new Strings();
 
@@ -79,6 +87,8 @@ string findDMDConfig(string dmdFilePath)
     import dmd.dinifile : findConfFile;
     import std.string : fromStringz, toStringz;
 
+    initDMD;
+
     auto f = findConfFile(dmdFilePath.toStringz, "dmd.conf");
     if (f is null)
         return null;
@@ -227,6 +237,8 @@ Module parseModule(string fileName, string code = null)
     import dmd.tokens : TOK;
     import std.string : toStringz;
 
+    initDMD;
+
     auto parse(Module m, string code)
     {
         scope p = new Parser!ASTCodegen(m, code, false);
diff --git a/test/dub_package/frontend.d b/test/dub_package/frontend.d
index c21bb9bdde9c..33f0448651fa 100755
--- a/test/dub_package/frontend.d
+++ b/test/dub_package/frontend.d
@@ -10,7 +10,6 @@ void main()
     import dmd.frontend;
     import std.algorithm : each;
 
-    initDMD;
     findImportPaths.each!addImport;
 
     auto m = parseModule("test.d", q{
diff --git a/test/dub_package/frontend_file.d b/test/dub_package/frontend_file.d
index 76cba133f39e..59f5c3e29af4 100755
--- a/test/dub_package/frontend_file.d
+++ b/test/dub_package/frontend_file.d
@@ -12,7 +12,6 @@ void main()
     import std.file : remove, tempDir, fwrite = write;
     import std.path : buildPath;
 
-    initDMD;
     findImportPaths.each!addImport;
 
     auto fileName = tempDir.buildPath("d_frontend_test.d");