diff --git a/util/LLgen/src/machdep.c b/util/LLgen/src/machdep.c
index babe3b34d..d04f9ac3d 100644
--- a/util/LLgen/src/machdep.c
+++ b/util/LLgen/src/machdep.c
@@ -43,17 +43,7 @@ void UNLINK(string x)
 #endif
 }
 
-void RENAME(string x,string y)
-{
-	/* Must move the file "x" to the file "y" */
 
-#ifdef USE_SYS
-	if(!sys_rename(x,y)) fatal(1,"Cannot rename to %s",y);
-#else
-	if (rename(x, y) == -1)
-		fatal(1, "Cannot rename to %s", y);
-#endif
-}
 
 string libpath(string s)
 {
diff --git a/util/LLgen/src/main.c b/util/LLgen/src/main.c
index f26446e51..1f1cab2be 100644
--- a/util/LLgen/src/main.c
+++ b/util/LLgen/src/main.c
@@ -353,6 +353,28 @@ void copyfile(string file)
 	fclose(f);
 }
 
+void copyto(string target, string source)
+{
+	FILE *fsource;
+	FILE *ftarget;
+	int c;
+
+	ftarget = fopen(target,"wb+");
+	if (ftarget == NULL)
+	{
+		fatal(0, "Cannot open file %s, call an expert", target);
+	}
+	fsource = fopen(source,"rb");
+	if (fsource == NULL)
+	{
+		fatal(0, "Cannot open file %s, call an expert", source);
+	}
+	while ((c = getc(fsource)) != EOF)
+		putc(c, ftarget);
+	fclose(fsource);
+	fclose(ftarget);
+}
+
 void install(string target, string source)
 {
 	/*
@@ -377,7 +399,7 @@ void install(string target, string source)
 	if ((f2 = fopen(target, "r")) == NULL)
 	{
 		fclose(f1);
-		RENAME(f_pars, target);
+		copyto(target, f_pars);
 		return;
 	}
 	/*
@@ -406,6 +428,6 @@ void install(string target, string source)
 		{
 			fatal(0, "%s : not a file generated by LLgen", target);
 		}
-		RENAME(f_pars, target);
+		copyto(target, f_pars);
 	}
 }