diff --git a/src/boot/me/dwarf.ml b/src/boot/me/dwarf.ml
index a568db417bd..bf974866c4d 100644
--- a/src/boot/me/dwarf.ml
+++ b/src/boot/me/dwarf.ml
@@ -2724,6 +2724,7 @@ let read_dies
                           | DW_FORM_data1 -> DATA_num (ar.asm_get_u8())
                           | DW_FORM_data4 -> DATA_num (ar.asm_get_u32())
                           | DW_FORM_flag -> DATA_num (ar.asm_get_u8())
+                          | DW_FORM_udata -> DATA_num (ar.asm_get_uleb())
                           | DW_FORM_block1 -> (adv_block1(); DATA_other)
                           | DW_FORM_block4 -> (adv_block4(); DATA_other)
                           | _ ->
diff --git a/src/lib/std.rc b/src/lib/std.rc
index 3ddfc04cfc8..80d21fb0ac0 100644
--- a/src/lib/std.rc
+++ b/src/lib/std.rc
@@ -16,6 +16,10 @@ mod _str;
 mod _io;
 mod sys;
 
+// Utility modules.
+
+mod util;
+
 // Authorize various rule-bendings.
 
 auth _io = unsafe;
diff --git a/src/rt/rust_crate_reader.cpp b/src/rt/rust_crate_reader.cpp
index b9b4497cc72..03d64b4bba9 100644
--- a/src/rt/rust_crate_reader.cpp
+++ b/src/rt/rust_crate_reader.cpp
@@ -347,6 +347,11 @@ rust_crate_reader::die::step_attr(attr &a) const
       return rdr->is_ok() || rdr->at_end();
       break;
 
+    case DW_FORM_udata:
+      rdr->get_uleb(u32);
+      return rdr->is_ok() || rdr->at_end();
+      break;
+
     default:
       rdr->mem.dom->log(rust_log::DWARF, "  unknown dwarf form: 0x%"
                         PRIxPTR, a.form);