Index: src/string/api.c
===================================================================
--- src/string/api.c	(revision 43141)
+++ src/string/api.c	(working copy)
@@ -290,7 +290,8 @@
     if (interp->parent_interpreter) {
         interp->hash_seed = interp->parent_interpreter->hash_seed;
     }
-    else {
+    /* interp is initialized from zeroed memory, so this is fine */
+    else if (interp->hash_seed == 0) {
         /* TT #64 - use an entropy source once available */
         Parrot_srand(Parrot_intval_time());
         interp->hash_seed = Parrot_uint_rand(0);
Index: compilers/imcc/main.c
===================================================================
--- compilers/imcc/main.c	(revision 43141)
+++ compilers/imcc/main.c	(working copy)
@@ -218,6 +218,7 @@
     "    -h --help\n"
     "    -V --version\n"
     "    -I --include add path to include search\n"
+    "    -H --hash-seed specify hex value to use as hash seed\n"
     "    -L --library add path to library search\n"
     "    -X --dynext add path to dynamic extension search\n"
     "   <Run core options>\n"
@@ -292,6 +293,7 @@
     { 'D', 'D', OPTION_optional_FLAG, { "--parrot-debug" } },
     { 'E', 'E', (OPTION_flags)0, { "--pre-process-only" } },
     { 'G', 'G', (OPTION_flags)0, { "--no-gc" } },
+    { 'H', 'H', OPTION_required_FLAG, { "--hash-seed" } },
     { 'I', 'I', OPTION_required_FLAG, { "--include" } },
     { 'L', 'L', OPTION_required_FLAG, { "--library" } },
     { 'O', 'O', OPTION_optional_FLAG, { "--optimize" } },
@@ -427,6 +429,11 @@
           case 'G':
             IMCC_INFO(interp)->gc_off = 1;
             break;
+          case 'H':
+            if (opt.opt_arg && is_all_hex_digits(opt.opt_arg)) {
+                interp->hash_seed = strtoul(opt.opt_arg, NULL, 16);
+            }
+            break;
           case '.':  /* Give Windows Parrot hackers an opportunity to
                       * attach a debuggger. */
             fgetc(stdin);